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tracing: Remove the ULONG_MAX stack trace hackery
[thirdparty/linux.git] / kernel / trace / trace_events_hist.c
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bcea3f96 1// SPDX-License-Identifier: GPL-2.0
7ef224d1
TZ		 2/*
3 * trace_events_hist - trace event hist triggers
4 *
7ef224d1
TZ		 5 * Copyright (C) 2015 Tom Zanussi <tom.zanussi@linux.intel.com>
6 */
7
8#include <linux/module.h>
9#include <linux/kallsyms.h>
10#include <linux/mutex.h>
11#include <linux/slab.h>
12#include <linux/stacktrace.h>
b2d09103 13#include <linux/rculist.h>
4b147936 14#include <linux/tracefs.h>
7ef224d1
TZ		 15
16#include "tracing_map.h"
17#include "trace.h"
7bbab38d 18#include "trace_dynevent.h"
7ef224d1 19
4b147936
TZ		 20#define SYNTH_SYSTEM "synthetic"
21#define SYNTH_FIELDS_MAX 16
22
23#define STR_VAR_LEN_MAX 32 /* must be multiple of sizeof(u64) */
24
7ef224d1
TZ		 25struct hist_field;
26
df35d93b
TZ		 27typedef u64 (*hist_field_fn_t) (struct hist_field *field,
28 struct tracing_map_elt *elt,
29 struct ring_buffer_event *rbe,
30 void *event);
7ef224d1 31
5819eadd 32#define HIST_FIELD_OPERANDS_MAX 2
30350d65 33#define HIST_FIELDS_MAX (TRACING_MAP_FIELDS_MAX + TRACING_MAP_VARS_MAX)
0212e2aa 34#define HIST_ACTIONS_MAX 8
30350d65 35
100719dc
TZ		 36enum field_op_id {
37 FIELD_OP_NONE,
38 FIELD_OP_PLUS,
39 FIELD_OP_MINUS,
40 FIELD_OP_UNARY_MINUS,
41};
42
05ddb25c
TZ		 43/*
44 * A hist_var (histogram variable) contains variable information for
45 * hist_fields having the HIST_FIELD_FL_VAR or HIST_FIELD_FL_VAR_REF
46 * flag set. A hist_var has a variable name e.g. ts0, and is
47 * associated with a given histogram trigger, as specified by
48 * hist_data. The hist_var idx is the unique index assigned to the
49 * variable by the hist trigger's tracing_map. The idx is what is
50 * used to set a variable's value and, by a variable reference, to
51 * retrieve it.
52 */
30350d65
TZ		 53struct hist_var {
54 char *name;
55 struct hist_trigger_data *hist_data;
56 unsigned int idx;
57};
5819eadd 58
7ef224d1
TZ		 59struct hist_field {
60 struct ftrace_event_field *field;
61 unsigned long flags;
62 hist_field_fn_t fn;
63 unsigned int size;
76a3b0c8 64 unsigned int offset;
5819eadd 65 unsigned int is_signed;
19a9facd 66 const char *type;
5819eadd 67 struct hist_field *operands[HIST_FIELD_OPERANDS_MAX];
b559d003 68 struct hist_trigger_data *hist_data;
05ddb25c
TZ		 69
70 /*
71 * Variable fields contain variable-specific info in var.
72 */
30350d65 73 struct hist_var var;
100719dc 74 enum field_op_id operator;
067fe038
TZ		 75 char *system;
76 char *event_name;
05ddb25c
TZ		 77
78 /*
79 * The name field is used for EXPR and VAR_REF fields. VAR
80 * fields contain the variable name in var.name.
81 */
100719dc 82 char *name;
05ddb25c
TZ		 83
84 /*
85 * When a histogram trigger is hit, if it has any references
86 * to variables, the values of those variables are collected
87 * into a var_ref_vals array by resolve_var_refs(). The
88 * current value of each variable is read from the tracing_map
89 * using the hist field's hist_var.idx and entered into the
90 * var_ref_idx entry i.e. var_ref_vals[var_ref_idx].
91 */
067fe038
TZ		 92 unsigned int var_ref_idx;
93 bool read_once;
7ef224d1
TZ		 94};
95
df35d93b
TZ		 96static u64 hist_field_none(struct hist_field *field,
97 struct tracing_map_elt *elt,
98 struct ring_buffer_event *rbe,
99 void *event)
69a0200c
TZ		 100{
101 return 0;
102}
103
df35d93b
TZ		 104static u64 hist_field_counter(struct hist_field *field,
105 struct tracing_map_elt *elt,
106 struct ring_buffer_event *rbe,
107 void *event)
7ef224d1
TZ		 108{
109 return 1;
110}
111
df35d93b
TZ		 112static u64 hist_field_string(struct hist_field *hist_field,
113 struct tracing_map_elt *elt,
114 struct ring_buffer_event *rbe,
115 void *event)
7ef224d1
TZ		 116{
117 char *addr = (char *)(event + hist_field->field->offset);
118
119 return (u64)(unsigned long)addr;
120}
121
df35d93b
TZ		 122static u64 hist_field_dynstring(struct hist_field *hist_field,
123 struct tracing_map_elt *elt,
124 struct ring_buffer_event *rbe,
125 void *event)
79e577cb
NK		 126{
127 u32 str_item = *(u32 *)(event + hist_field->field->offset);
128 int str_loc = str_item & 0xffff;
129 char *addr = (char *)(event + str_loc);
130
131 return (u64)(unsigned long)addr;
132}
133
df35d93b
TZ		 134static u64 hist_field_pstring(struct hist_field *hist_field,
135 struct tracing_map_elt *elt,
136 struct ring_buffer_event *rbe,
137 void *event)
79e577cb
NK		 138{
139 char **addr = (char **)(event + hist_field->field->offset);
140
141 return (u64)(unsigned long)*addr;
142}
143
df35d93b
TZ		 144static u64 hist_field_log2(struct hist_field *hist_field,
145 struct tracing_map_elt *elt,
146 struct ring_buffer_event *rbe,
147 void *event)
4b94f5b7 148{
5819eadd
TZ		 149 struct hist_field *operand = hist_field->operands[0];
150
df35d93b 151 u64 val = operand->fn(operand, elt, rbe, event);
4b94f5b7
NK		 152
153 return (u64) ilog2(roundup_pow_of_two(val));
154}
155
df35d93b
TZ		 156static u64 hist_field_plus(struct hist_field *hist_field,
157 struct tracing_map_elt *elt,
158 struct ring_buffer_event *rbe,
159 void *event)
100719dc
TZ		 160{
161 struct hist_field *operand1 = hist_field->operands[0];
162 struct hist_field *operand2 = hist_field->operands[1];
163
df35d93b
TZ		 164 u64 val1 = operand1->fn(operand1, elt, rbe, event);
165 u64 val2 = operand2->fn(operand2, elt, rbe, event);
100719dc
TZ		 166
167 return val1 + val2;
168}
169
df35d93b
TZ		 170static u64 hist_field_minus(struct hist_field *hist_field,
171 struct tracing_map_elt *elt,
172 struct ring_buffer_event *rbe,
173 void *event)
100719dc
TZ		 174{
175 struct hist_field *operand1 = hist_field->operands[0];
176 struct hist_field *operand2 = hist_field->operands[1];
177
df35d93b
TZ		 178 u64 val1 = operand1->fn(operand1, elt, rbe, event);
179 u64 val2 = operand2->fn(operand2, elt, rbe, event);
100719dc
TZ		 180
181 return val1 - val2;
182}
183
df35d93b
TZ		 184static u64 hist_field_unary_minus(struct hist_field *hist_field,
185 struct tracing_map_elt *elt,
186 struct ring_buffer_event *rbe,
187 void *event)
100719dc
TZ		 188{
189 struct hist_field *operand = hist_field->operands[0];
190
df35d93b 191 s64 sval = (s64)operand->fn(operand, elt, rbe, event);
100719dc
TZ		 192 u64 val = (u64)-sval;
193
194 return val;
195}
196
7ef224d1 197#define DEFINE_HIST_FIELD_FN(type) \
fbd302cb 198 static u64 hist_field_##type(struct hist_field *hist_field, \
df35d93b
TZ		 199 struct tracing_map_elt *elt, \
200 struct ring_buffer_event *rbe, \
201 void *event) \
7ef224d1
TZ		 202{ \
203 type *addr = (type *)(event + hist_field->field->offset); \
204 \
79e577cb 205 return (u64)(unsigned long)*addr; \
7ef224d1
TZ		 206}
207
208DEFINE_HIST_FIELD_FN(s64);
209DEFINE_HIST_FIELD_FN(u64);
210DEFINE_HIST_FIELD_FN(s32);
211DEFINE_HIST_FIELD_FN(u32);
212DEFINE_HIST_FIELD_FN(s16);
213DEFINE_HIST_FIELD_FN(u16);
214DEFINE_HIST_FIELD_FN(s8);
215DEFINE_HIST_FIELD_FN(u8);
216
217#define for_each_hist_field(i, hist_data) \
218 for ((i) = 0; (i) < (hist_data)->n_fields; (i)++)
219
220#define for_each_hist_val_field(i, hist_data) \
221 for ((i) = 0; (i) < (hist_data)->n_vals; (i)++)
222
223#define for_each_hist_key_field(i, hist_data) \
224 for ((i) = (hist_data)->n_vals; (i) < (hist_data)->n_fields; (i)++)
225
69a0200c
TZ		 226#define HIST_STACKTRACE_DEPTH 16
227#define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long))
228#define HIST_STACKTRACE_SKIP 5
229
7ef224d1 230#define HITCOUNT_IDX 0
69a0200c 231#define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + HIST_STACKTRACE_SIZE)
7ef224d1
TZ		 232
233enum hist_field_flags {
0d7a8325
TZ		 234 HIST_FIELD_FL_HITCOUNT = 1 << 0,
235 HIST_FIELD_FL_KEY = 1 << 1,
236 HIST_FIELD_FL_STRING = 1 << 2,
237 HIST_FIELD_FL_HEX = 1 << 3,
238 HIST_FIELD_FL_SYM = 1 << 4,
239 HIST_FIELD_FL_SYM_OFFSET = 1 << 5,
240 HIST_FIELD_FL_EXECNAME = 1 << 6,
241 HIST_FIELD_FL_SYSCALL = 1 << 7,
242 HIST_FIELD_FL_STACKTRACE = 1 << 8,
243 HIST_FIELD_FL_LOG2 = 1 << 9,
ad42febe 244 HIST_FIELD_FL_TIMESTAMP = 1 << 10,
860f9f6b 245 HIST_FIELD_FL_TIMESTAMP_USECS = 1 << 11,
30350d65 246 HIST_FIELD_FL_VAR = 1 << 12,
100719dc 247 HIST_FIELD_FL_EXPR = 1 << 13,
067fe038 248 HIST_FIELD_FL_VAR_REF = 1 << 14,
8b7622bf 249 HIST_FIELD_FL_CPU = 1 << 15,
7e8b88a3 250 HIST_FIELD_FL_ALIAS = 1 << 16,
30350d65
TZ		 251};
252
253struct var_defs {
254 unsigned int n_vars;
255 char *name[TRACING_MAP_VARS_MAX];
256 char *expr[TRACING_MAP_VARS_MAX];
7ef224d1
TZ		 257};
258
259struct hist_trigger_attrs {
260 char *keys_str;
f2606835 261 char *vals_str;
e62347d2 262 char *sort_key_str;
5463bfda 263 char *name;
a4072fe8 264 char *clock;
83e99914
TZ		 265 bool pause;
266 bool cont;
e86ae9ba 267 bool clear;
860f9f6b 268 bool ts_in_usecs;
7ef224d1 269 unsigned int map_bits;
30350d65
TZ		 270
271 char *assignment_str[TRACING_MAP_VARS_MAX];
272 unsigned int n_assignments;
273
0212e2aa
TZ		 274 char *action_str[HIST_ACTIONS_MAX];
275 unsigned int n_actions;
276
30350d65 277 struct var_defs var_defs;
7ef224d1
TZ		 278};
279
02205a67
TZ		 280struct field_var {
281 struct hist_field *var;
282 struct hist_field *val;
283};
284
285struct field_var_hist {
286 struct hist_trigger_data *hist_data;
287 char *cmd;
288};
289
7ef224d1 290struct hist_trigger_data {
30350d65 291 struct hist_field *fields[HIST_FIELDS_MAX];
7ef224d1
TZ		 292 unsigned int n_vals;
293 unsigned int n_keys;
294 unsigned int n_fields;
30350d65 295 unsigned int n_vars;
7ef224d1
TZ		 296 unsigned int key_size;
297 struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX];
298 unsigned int n_sort_keys;
299 struct trace_event_file *event_file;
300 struct hist_trigger_attrs *attrs;
301 struct tracing_map *map;
ad42febe 302 bool enable_timestamps;
30350d65 303 bool remove;
067fe038
TZ		 304 struct hist_field *var_refs[TRACING_MAP_VARS_MAX];
305 unsigned int n_var_refs;
0212e2aa
TZ		 306
307 struct action_data *actions[HIST_ACTIONS_MAX];
308 unsigned int n_actions;
02205a67
TZ		 309
310 struct field_var *field_vars[SYNTH_FIELDS_MAX];
311 unsigned int n_field_vars;
312 unsigned int n_field_var_str;
313 struct field_var_hist *field_var_hists[SYNTH_FIELDS_MAX];
314 unsigned int n_field_var_hists;
50450603 315
7d18a10c
TZ		 316 struct field_var *save_vars[SYNTH_FIELDS_MAX];
317 unsigned int n_save_vars;
318 unsigned int n_save_var_str;
0212e2aa
TZ		 319};
320
7bbab38d
MH		 321static int synth_event_create(int argc, const char **argv);
322static int synth_event_show(struct seq_file *m, struct dyn_event *ev);
323static int synth_event_release(struct dyn_event *ev);
324static bool synth_event_is_busy(struct dyn_event *ev);
325static bool synth_event_match(const char *system, const char *event,
326 struct dyn_event *ev);
327
328static struct dyn_event_operations synth_event_ops = {
329 .create = synth_event_create,
330 .show = synth_event_show,
331 .is_busy = synth_event_is_busy,
332 .free = synth_event_release,
333 .match = synth_event_match,
334};
335
4b147936
TZ		 336struct synth_field {
337 char *type;
338 char *name;
339 size_t size;
340 bool is_signed;
341 bool is_string;
342};
343
344struct synth_event {
7bbab38d 345 struct dyn_event devent;
4b147936
TZ		 346 int ref;
347 char *name;
348 struct synth_field **fields;
349 unsigned int n_fields;
350 unsigned int n_u64;
351 struct trace_event_class class;
352 struct trace_event_call call;
353 struct tracepoint *tp;
354};
355
7bbab38d
MH		 356static bool is_synth_event(struct dyn_event *ev)
357{
358 return ev->ops == &synth_event_ops;
359}
360
361static struct synth_event *to_synth_event(struct dyn_event *ev)
362{
363 return container_of(ev, struct synth_event, devent);
364}
365
366static bool synth_event_is_busy(struct dyn_event *ev)
367{
368 struct synth_event *event = to_synth_event(ev);
369
370 return event->ref != 0;
371}
372
373static bool synth_event_match(const char *system, const char *event,
374 struct dyn_event *ev)
375{
376 struct synth_event *sev = to_synth_event(ev);
377
378 return strcmp(sev->name, event) == 0 &&
379 (!system || strcmp(system, SYNTH_SYSTEM) == 0);
380}
381
0212e2aa
TZ		 382struct action_data;
383
384typedef void (*action_fn_t) (struct hist_trigger_data *hist_data,
385 struct tracing_map_elt *elt, void *rec,
7d18a10c 386 struct ring_buffer_event *rbe, void *key,
0212e2aa
TZ		 387 struct action_data *data, u64 *var_ref_vals);
388
466f4528
TZ		 389typedef bool (*check_track_val_fn_t) (u64 track_val, u64 var_val);
390
7d18a10c
TZ		 391enum handler_id {
392 HANDLER_ONMATCH = 1,
393 HANDLER_ONMAX,
dff81f55 394 HANDLER_ONCHANGE,
7d18a10c
TZ		 395};
396
397enum action_id {
398 ACTION_SAVE = 1,
399 ACTION_TRACE,
a3785b7e 400 ACTION_SNAPSHOT,
7d18a10c
TZ		 401};
402
0212e2aa 403struct action_data {
7d18a10c
TZ		 404 enum handler_id handler;
405 enum action_id action;
406 char *action_name;
0212e2aa 407 action_fn_t fn;
7d18a10c 408
c282a386
TZ		 409 unsigned int n_params;
410 char *params[SYNTH_FIELDS_MAX];
411
c3e49506
TZ		 412 /*
413 * When a histogram trigger is hit, the values of any
414 * references to variables, including variables being passed
415 * as parameters to synthetic events, are collected into a
416 * var_ref_vals array. This var_ref_idx is the index of the
417 * first param in the array to be passed to the synthetic
418 * event invocation.
419 */
420 unsigned int var_ref_idx;
421 struct synth_event *synth_event;
e91eefd7
TZ		 422 bool use_trace_keyword;
423 char *synth_event_name;
c3e49506 424
c282a386
TZ		 425 union {
426 struct {
c3e49506
TZ		 427 char *event;
428 char *event_system;
429 } match_data;
50450603
TZ		 430
431 struct {
466f4528
TZ		 432 /*
433 * var_str contains the $-unstripped variable
434 * name referenced by var_ref, and used when
435 * printing the action. Because var_ref
436 * creation is deferred to create_actions(),
437 * we need a per-action way to save it until
438 * then, thus var_str.
439 */
50450603 440 char *var_str;
466f4528
TZ		 441
442 /*
443 * var_ref refers to the variable being
444 * tracked e.g onmax($var).
445 */
446 struct hist_field *var_ref;
447
448 /*
449 * track_var contains the 'invisible' tracking
450 * variable created to keep the current
451 * e.g. max value.
452 */
453 struct hist_field *track_var;
454
455 check_track_val_fn_t check_val;
456 action_fn_t save_data;
457 } track_data;
c282a386 458 };
7ef224d1
TZ		 459};
460
a3785b7e
TZ		 461struct track_data {
462 u64 track_val;
463 bool updated;
464
465 unsigned int key_len;
466 void *key;
467 struct tracing_map_elt elt;
468
469 struct action_data *action_data;
470 struct hist_trigger_data *hist_data;
471};
472
473struct hist_elt_data {
474 char *comm;
475 u64 *var_ref_vals;
476 char *field_var_str[SYNTH_FIELDS_MAX];
477};
478
479struct snapshot_context {
480 struct tracing_map_elt *elt;
481 void *key;
482};
483
484static void track_data_free(struct track_data *track_data)
485{
486 struct hist_elt_data *elt_data;
487
488 if (!track_data)
489 return;
490
491 kfree(track_data->key);
492
493 elt_data = track_data->elt.private_data;
494 if (elt_data) {
495 kfree(elt_data->comm);
496 kfree(elt_data);
497 }
498
499 kfree(track_data);
500}
501
502static struct track_data *track_data_alloc(unsigned int key_len,
503 struct action_data *action_data,
504 struct hist_trigger_data *hist_data)
505{
506 struct track_data *data = kzalloc(sizeof(*data), GFP_KERNEL);
507 struct hist_elt_data *elt_data;
508
509 if (!data)
510 return ERR_PTR(-ENOMEM);
511
512 data->key = kzalloc(key_len, GFP_KERNEL);
513 if (!data->key) {
514 track_data_free(data);
515 return ERR_PTR(-ENOMEM);
516 }
517
518 data->key_len = key_len;
519 data->action_data = action_data;
520 data->hist_data = hist_data;
521
522 elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
523 if (!elt_data) {
524 track_data_free(data);
525 return ERR_PTR(-ENOMEM);
526 }
527 data->elt.private_data = elt_data;
528
529 elt_data->comm = kzalloc(TASK_COMM_LEN, GFP_KERNEL);
530 if (!elt_data->comm) {
531 track_data_free(data);
532 return ERR_PTR(-ENOMEM);
533 }
534
535 return data;
536}
537
f404da6e
TZ		 538static char last_hist_cmd[MAX_FILTER_STR_VAL];
539static char hist_err_str[MAX_FILTER_STR_VAL];
540
541static void last_cmd_set(char *str)
542{
543 if (!str)
544 return;
545
546 strncpy(last_hist_cmd, str, MAX_FILTER_STR_VAL - 1);
547}
548
549static void hist_err(char *str, char *var)
550{
551 int maxlen = MAX_FILTER_STR_VAL - 1;
552
553 if (!str)
554 return;
555
556 if (strlen(hist_err_str))
557 return;
558
559 if (!var)
560 var = "";
561
562 if (strlen(hist_err_str) + strlen(str) + strlen(var) > maxlen)
563 return;
564
565 strcat(hist_err_str, str);
566 strcat(hist_err_str, var);
567}
568
569static void hist_err_event(char *str, char *system, char *event, char *var)
570{
571 char err[MAX_FILTER_STR_VAL];
572
573 if (system && var)
574 snprintf(err, MAX_FILTER_STR_VAL, "%s.%s.%s", system, event, var);
575 else if (system)
576 snprintf(err, MAX_FILTER_STR_VAL, "%s.%s", system, event);
577 else
cf4d418e 578 strscpy(err, var, MAX_FILTER_STR_VAL);
f404da6e
TZ		 579
580 hist_err(str, err);
581}
582
583static void hist_err_clear(void)
584{
585 hist_err_str[0] = '\0';
586}
587
588static bool have_hist_err(void)
589{
590 if (strlen(hist_err_str))
591 return true;
592
593 return false;
594}
595
4b147936
TZ		 596struct synth_trace_event {
597 struct trace_entry ent;
598 u64 fields[];
599};
600
601static int synth_event_define_fields(struct trace_event_call *call)
602{
603 struct synth_trace_event trace;
604 int offset = offsetof(typeof(trace), fields);
605 struct synth_event *event = call->data;
606 unsigned int i, size, n_u64;
607 char *name, *type;
608 bool is_signed;
609 int ret = 0;
610
611 for (i = 0, n_u64 = 0; i < event->n_fields; i++) {
612 size = event->fields[i]->size;
613 is_signed = event->fields[i]->is_signed;
614 type = event->fields[i]->type;
615 name = event->fields[i]->name;
616 ret = trace_define_field(call, type, name, offset, size,
617 is_signed, FILTER_OTHER);
618 if (ret)
619 break;
620
621 if (event->fields[i]->is_string) {
622 offset += STR_VAR_LEN_MAX;
623 n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
624 } else {
625 offset += sizeof(u64);
626 n_u64++;
627 }
628 }
629
630 event->n_u64 = n_u64;
631
632 return ret;
633}
634
635static bool synth_field_signed(char *type)
636{
b6b27355 637 if (str_has_prefix(type, "u"))
4b147936
TZ		 638 return false;
639
640 return true;
641}
642
643static int synth_field_is_string(char *type)
644{
645 if (strstr(type, "char[") != NULL)
646 return true;
647
648 return false;
649}
650
651static int synth_field_string_size(char *type)
652{
653 char buf[4], *end, *start;
654 unsigned int len;
655 int size, err;
656
657 start = strstr(type, "char[");
658 if (start == NULL)
659 return -EINVAL;
2f31ed93 660 start += sizeof("char[") - 1;
4b147936
TZ		 661
662 end = strchr(type, ']');
663 if (!end || end < start)
664 return -EINVAL;
665
666 len = end - start;
667 if (len > 3)
668 return -EINVAL;
669
670 strncpy(buf, start, len);
671 buf[len] = '\0';
672
673 err = kstrtouint(buf, 0, &size);
674 if (err)
675 return err;
676
677 if (size > STR_VAR_LEN_MAX)
678 return -EINVAL;
679
680 return size;
681}
682
683static int synth_field_size(char *type)
684{
685 int size = 0;
686
687 if (strcmp(type, "s64") == 0)
688 size = sizeof(s64);
689 else if (strcmp(type, "u64") == 0)
690 size = sizeof(u64);
691 else if (strcmp(type, "s32") == 0)
692 size = sizeof(s32);
693 else if (strcmp(type, "u32") == 0)
694 size = sizeof(u32);
695 else if (strcmp(type, "s16") == 0)
696 size = sizeof(s16);
697 else if (strcmp(type, "u16") == 0)
698 size = sizeof(u16);
699 else if (strcmp(type, "s8") == 0)
700 size = sizeof(s8);
701 else if (strcmp(type, "u8") == 0)
702 size = sizeof(u8);
703 else if (strcmp(type, "char") == 0)
704 size = sizeof(char);
705 else if (strcmp(type, "unsigned char") == 0)
706 size = sizeof(unsigned char);
707 else if (strcmp(type, "int") == 0)
708 size = sizeof(int);
709 else if (strcmp(type, "unsigned int") == 0)
710 size = sizeof(unsigned int);
711 else if (strcmp(type, "long") == 0)
712 size = sizeof(long);
713 else if (strcmp(type, "unsigned long") == 0)
714 size = sizeof(unsigned long);
715 else if (strcmp(type, "pid_t") == 0)
716 size = sizeof(pid_t);
717 else if (synth_field_is_string(type))
718 size = synth_field_string_size(type);
719
720 return size;
721}
722
723static const char *synth_field_fmt(char *type)
724{
725 const char *fmt = "%llu";
726
727 if (strcmp(type, "s64") == 0)
728 fmt = "%lld";
729 else if (strcmp(type, "u64") == 0)
730 fmt = "%llu";
731 else if (strcmp(type, "s32") == 0)
732 fmt = "%d";
733 else if (strcmp(type, "u32") == 0)
734 fmt = "%u";
735 else if (strcmp(type, "s16") == 0)
736 fmt = "%d";
737 else if (strcmp(type, "u16") == 0)
738 fmt = "%u";
739 else if (strcmp(type, "s8") == 0)
740 fmt = "%d";
741 else if (strcmp(type, "u8") == 0)
742 fmt = "%u";
743 else if (strcmp(type, "char") == 0)
744 fmt = "%d";
745 else if (strcmp(type, "unsigned char") == 0)
746 fmt = "%u";
747 else if (strcmp(type, "int") == 0)
748 fmt = "%d";
749 else if (strcmp(type, "unsigned int") == 0)
750 fmt = "%u";
751 else if (strcmp(type, "long") == 0)
752 fmt = "%ld";
753 else if (strcmp(type, "unsigned long") == 0)
754 fmt = "%lu";
755 else if (strcmp(type, "pid_t") == 0)
756 fmt = "%d";
757 else if (synth_field_is_string(type))
758 fmt = "%s";
759
760 return fmt;
761}
762
763static enum print_line_t print_synth_event(struct trace_iterator *iter,
764 int flags,
765 struct trace_event *event)
766{
767 struct trace_array *tr = iter->tr;
768 struct trace_seq *s = &iter->seq;
769 struct synth_trace_event *entry;
770 struct synth_event *se;
771 unsigned int i, n_u64;
772 char print_fmt[32];
773 const char *fmt;
774
775 entry = (struct synth_trace_event *)iter->ent;
776 se = container_of(event, struct synth_event, call.event);
777
778 trace_seq_printf(s, "%s: ", se->name);
779
780 for (i = 0, n_u64 = 0; i < se->n_fields; i++) {
781 if (trace_seq_has_overflowed(s))
782 goto end;
783
784 fmt = synth_field_fmt(se->fields[i]->type);
785
786 /* parameter types */
787 if (tr->trace_flags & TRACE_ITER_VERBOSE)
788 trace_seq_printf(s, "%s ", fmt);
789
790 snprintf(print_fmt, sizeof(print_fmt), "%%s=%s%%s", fmt);
791
792 /* parameter values */
793 if (se->fields[i]->is_string) {
794 trace_seq_printf(s, print_fmt, se->fields[i]->name,
795 (char *)&entry->fields[n_u64],
796 i == se->n_fields - 1 ? "" : " ");
797 n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
798 } else {
799 trace_seq_printf(s, print_fmt, se->fields[i]->name,
800 entry->fields[n_u64],
801 i == se->n_fields - 1 ? "" : " ");
802 n_u64++;
803 }
804 }
805end:
806 trace_seq_putc(s, '\n');
807
808 return trace_handle_return(s);
809}
810
811static struct trace_event_functions synth_event_funcs = {
812 .trace = print_synth_event
813};
814
815static notrace void trace_event_raw_event_synth(void *__data,
816 u64 *var_ref_vals,
817 unsigned int var_ref_idx)
818{
819 struct trace_event_file *trace_file = __data;
820 struct synth_trace_event *entry;
821 struct trace_event_buffer fbuffer;
4708abc6 822 struct ring_buffer *buffer;
4b147936
TZ		 823 struct synth_event *event;
824 unsigned int i, n_u64;
825 int fields_size = 0;
826
827 event = trace_file->event_call->data;
828
829 if (trace_trigger_soft_disabled(trace_file))
830 return;
831
832 fields_size = event->n_u64 * sizeof(u64);
833
4708abc6
SRV		 834 /*
835 * Avoid ring buffer recursion detection, as this event
836 * is being performed within another event.
837 */
838 buffer = trace_file->tr->trace_buffer.buffer;
839 ring_buffer_nest_start(buffer);
840
4b147936
TZ		 841 entry = trace_event_buffer_reserve(&fbuffer, trace_file,
842 sizeof(*entry) + fields_size);
843 if (!entry)
4708abc6 844 goto out;
4b147936
TZ		 845
846 for (i = 0, n_u64 = 0; i < event->n_fields; i++) {
847 if (event->fields[i]->is_string) {
848 char *str_val = (char *)(long)var_ref_vals[var_ref_idx + i];
849 char *str_field = (char *)&entry->fields[n_u64];
850
ad452870 851 strscpy(str_field, str_val, STR_VAR_LEN_MAX);
4b147936
TZ		 852 n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
853 } else {
854 entry->fields[n_u64] = var_ref_vals[var_ref_idx + i];
855 n_u64++;
856 }
857 }
858
859 trace_event_buffer_commit(&fbuffer);
4708abc6
SRV		 860out:
861 ring_buffer_nest_end(buffer);
4b147936
TZ		 862}
863
864static void free_synth_event_print_fmt(struct trace_event_call *call)
865{
866 if (call) {
867 kfree(call->print_fmt);
868 call->print_fmt = NULL;
869 }
870}
871
872static int __set_synth_event_print_fmt(struct synth_event *event,
873 char *buf, int len)
874{
875 const char *fmt;
876 int pos = 0;
877 int i;
878
879 /* When len=0, we just calculate the needed length */
880#define LEN_OR_ZERO (len ? len - pos : 0)
881
882 pos += snprintf(buf + pos, LEN_OR_ZERO, "\"");
883 for (i = 0; i < event->n_fields; i++) {
884 fmt = synth_field_fmt(event->fields[i]->type);
885 pos += snprintf(buf + pos, LEN_OR_ZERO, "%s=%s%s",
886 event->fields[i]->name, fmt,
887 i == event->n_fields - 1 ? "" : ", ");
888 }
889 pos += snprintf(buf + pos, LEN_OR_ZERO, "\"");
890
891 for (i = 0; i < event->n_fields; i++) {
892 pos += snprintf(buf + pos, LEN_OR_ZERO,
893 ", REC->%s", event->fields[i]->name);
894 }
895
896#undef LEN_OR_ZERO
897
898 /* return the length of print_fmt */
899 return pos;
900}
901
902static int set_synth_event_print_fmt(struct trace_event_call *call)
903{
904 struct synth_event *event = call->data;
905 char *print_fmt;
906 int len;
907
908 /* First: called with 0 length to calculate the needed length */
909 len = __set_synth_event_print_fmt(event, NULL, 0);
910
911 print_fmt = kmalloc(len + 1, GFP_KERNEL);
912 if (!print_fmt)
913 return -ENOMEM;
914
915 /* Second: actually write the @print_fmt */
916 __set_synth_event_print_fmt(event, print_fmt, len + 1);
917 call->print_fmt = print_fmt;
918
919 return 0;
920}
921
922static void free_synth_field(struct synth_field *field)
923{
924 kfree(field->type);
925 kfree(field->name);
926 kfree(field);
927}
928
7bbab38d 929static struct synth_field *parse_synth_field(int argc, const char **argv,
282447ba 930 int *consumed)
4b147936
TZ		 931{
932 struct synth_field *field;
7bbab38d 933 const char *prefix = NULL, *field_type = argv[0], *field_name, *array;
4b147936 934 int len, ret = 0;
4b147936
TZ		 935
936 if (field_type[0] == ';')
937 field_type++;
938
282447ba
MH		 939 if (!strcmp(field_type, "unsigned")) {
940 if (argc < 3)
941 return ERR_PTR(-EINVAL);
942 prefix = "unsigned ";
943 field_type = argv[1];
944 field_name = argv[2];
945 *consumed = 3;
946 } else {
947 field_name = argv[1];
948 *consumed = 2;
949 }
950
4b147936
TZ		 951 field = kzalloc(sizeof(*field), GFP_KERNEL);
952 if (!field)
953 return ERR_PTR(-ENOMEM);
954
7bbab38d 955 len = strlen(field_name);
4b147936 956 array = strchr(field_name, '[');
7bbab38d
MH		 957 if (array)
958 len -= strlen(array);
959 else if (field_name[len - 1] == ';')
960 len--;
961
962 field->name = kmemdup_nul(field_name, len, GFP_KERNEL);
963 if (!field->name) {
964 ret = -ENOMEM;
965 goto free;
966 }
967
968 if (field_type[0] == ';')
969 field_type++;
970 len = strlen(field_type) + 1;
4b147936
TZ		 971 if (array)
972 len += strlen(array);
282447ba
MH		 973 if (prefix)
974 len += strlen(prefix);
7bbab38d 975
4b147936
TZ		 976 field->type = kzalloc(len, GFP_KERNEL);
977 if (!field->type) {
978 ret = -ENOMEM;
979 goto free;
980 }
282447ba
MH		 981 if (prefix)
982 strcat(field->type, prefix);
4b147936
TZ		 983 strcat(field->type, field_type);
984 if (array) {
985 strcat(field->type, array);
7bbab38d
MH		 986 if (field->type[len - 1] == ';')
987 field->type[len - 1] = '\0';
4b147936
TZ		 988 }
989
990 field->size = synth_field_size(field->type);
991 if (!field->size) {
992 ret = -EINVAL;
993 goto free;
994 }
995
996 if (synth_field_is_string(field->type))
997 field->is_string = true;
998
999 field->is_signed = synth_field_signed(field->type);
1000
4b147936
TZ		 1001 out:
1002 return field;
1003 free:
1004 free_synth_field(field);
1005 field = ERR_PTR(ret);
1006 goto out;
1007}
1008
1009static void free_synth_tracepoint(struct tracepoint *tp)
1010{
1011 if (!tp)
1012 return;
1013
1014 kfree(tp->name);
1015 kfree(tp);
1016}
1017
1018static struct tracepoint *alloc_synth_tracepoint(char *name)
1019{
1020 struct tracepoint *tp;
1021
1022 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
1023 if (!tp)
1024 return ERR_PTR(-ENOMEM);
1025
1026 tp->name = kstrdup(name, GFP_KERNEL);
1027 if (!tp->name) {
1028 kfree(tp);
1029 return ERR_PTR(-ENOMEM);
1030 }
1031
1032 return tp;
1033}
1034
1035typedef void (*synth_probe_func_t) (void *__data, u64 *var_ref_vals,
1036 unsigned int var_ref_idx);
1037
1038static inline void trace_synth(struct synth_event *event, u64 *var_ref_vals,
1039 unsigned int var_ref_idx)
1040{
1041 struct tracepoint *tp = event->tp;
1042
1043 if (unlikely(atomic_read(&tp->key.enabled) > 0)) {
1044 struct tracepoint_func *probe_func_ptr;
1045 synth_probe_func_t probe_func;
1046 void *__data;
1047
1048 if (!(cpu_online(raw_smp_processor_id())))
1049 return;
1050
1051 probe_func_ptr = rcu_dereference_sched((tp)->funcs);
1052 if (probe_func_ptr) {
1053 do {
1054 probe_func = probe_func_ptr->func;
1055 __data = probe_func_ptr->data;
1056 probe_func(__data, var_ref_vals, var_ref_idx);
1057 } while ((++probe_func_ptr)->func);
1058 }
1059 }
1060}
1061
1062static struct synth_event *find_synth_event(const char *name)
1063{
7bbab38d 1064 struct dyn_event *pos;
4b147936
TZ		 1065 struct synth_event *event;
1066
7bbab38d
MH		 1067 for_each_dyn_event(pos) {
1068 if (!is_synth_event(pos))
1069 continue;
1070 event = to_synth_event(pos);
4b147936
TZ		 1071 if (strcmp(event->name, name) == 0)
1072 return event;
1073 }
1074
1075 return NULL;
1076}
1077
1078static int register_synth_event(struct synth_event *event)
1079{
1080 struct trace_event_call *call = &event->call;
1081 int ret = 0;
1082
1083 event->call.class = &event->class;
1084 event->class.system = kstrdup(SYNTH_SYSTEM, GFP_KERNEL);
1085 if (!event->class.system) {
1086 ret = -ENOMEM;
1087 goto out;
1088 }
1089
1090 event->tp = alloc_synth_tracepoint(event->name);
1091 if (IS_ERR(event->tp)) {
1092 ret = PTR_ERR(event->tp);
1093 event->tp = NULL;
1094 goto out;
1095 }
1096
1097 INIT_LIST_HEAD(&call->class->fields);
1098 call->event.funcs = &synth_event_funcs;
1099 call->class->define_fields = synth_event_define_fields;
1100
1101 ret = register_trace_event(&call->event);
1102 if (!ret) {
1103 ret = -ENODEV;
1104 goto out;
1105 }
1106 call->flags = TRACE_EVENT_FL_TRACEPOINT;
1107 call->class->reg = trace_event_reg;
1108 call->class->probe = trace_event_raw_event_synth;
1109 call->data = event;
1110 call->tp = event->tp;
1111
7e1413ed 1112 ret = trace_add_event_call(call);
4b147936
TZ		 1113 if (ret) {
1114 pr_warn("Failed to register synthetic event: %s\n",
1115 trace_event_name(call));
1116 goto err;
1117 }
1118
1119 ret = set_synth_event_print_fmt(call);
1120 if (ret < 0) {
7e1413ed 1121 trace_remove_event_call(call);
4b147936
TZ		 1122 goto err;
1123 }
1124 out:
1125 return ret;
1126 err:
1127 unregister_trace_event(&call->event);
1128 goto out;
1129}
1130
1131static int unregister_synth_event(struct synth_event *event)
1132{
1133 struct trace_event_call *call = &event->call;
1134 int ret;
1135
7e1413ed 1136 ret = trace_remove_event_call(call);
4b147936
TZ		 1137
1138 return ret;
1139}
1140
1141static void free_synth_event(struct synth_event *event)
1142{
1143 unsigned int i;
1144
1145 if (!event)
1146 return;
1147
1148 for (i = 0; i < event->n_fields; i++)
1149 free_synth_field(event->fields[i]);
1150
1151 kfree(event->fields);
1152 kfree(event->name);
1153 kfree(event->class.system);
1154 free_synth_tracepoint(event->tp);
1155 free_synth_event_print_fmt(&event->call);
1156 kfree(event);
1157}
1158
7bbab38d 1159static struct synth_event *alloc_synth_event(const char *name, int n_fields,
4b147936
TZ		 1160 struct synth_field **fields)
1161{
1162 struct synth_event *event;
1163 unsigned int i;
1164
1165 event = kzalloc(sizeof(*event), GFP_KERNEL);
1166 if (!event) {
1167 event = ERR_PTR(-ENOMEM);
1168 goto out;
1169 }
1170
7bbab38d 1171 event->name = kstrdup(name, GFP_KERNEL);
4b147936
TZ		 1172 if (!event->name) {
1173 kfree(event);
1174 event = ERR_PTR(-ENOMEM);
1175 goto out;
1176 }
1177
1178 event->fields = kcalloc(n_fields, sizeof(*event->fields), GFP_KERNEL);
1179 if (!event->fields) {
1180 free_synth_event(event);
1181 event = ERR_PTR(-ENOMEM);
1182 goto out;
1183 }
1184
7bbab38d
MH		 1185 dyn_event_init(&event->devent, &synth_event_ops);
1186
4b147936
TZ		 1187 for (i = 0; i < n_fields; i++)
1188 event->fields[i] = fields[i];
1189
1190 event->n_fields = n_fields;
1191 out:
1192 return event;
1193}
1194
c282a386
TZ		 1195static void action_trace(struct hist_trigger_data *hist_data,
1196 struct tracing_map_elt *elt, void *rec,
7d18a10c 1197 struct ring_buffer_event *rbe, void *key,
c282a386
TZ		 1198 struct action_data *data, u64 *var_ref_vals)
1199{
c3e49506 1200 struct synth_event *event = data->synth_event;
c282a386 1201
c3e49506 1202 trace_synth(event, var_ref_vals, data->var_ref_idx);
c282a386
TZ		 1203}
1204
1205struct hist_var_data {
1206 struct list_head list;
1207 struct hist_trigger_data *hist_data;
1208};
1209
7bbab38d 1210static int __create_synth_event(int argc, const char *name, const char **argv)
4b147936
TZ		 1211{
1212 struct synth_field *field, *fields[SYNTH_FIELDS_MAX];
1213 struct synth_event *event = NULL;
282447ba 1214 int i, consumed = 0, n_fields = 0, ret = 0;
4b147936
TZ		 1215
1216 /*
1217 * Argument syntax:
1218 * - Add synthetic event: <event_name> field[;field] ...
1219 * - Remove synthetic event: !<event_name> field[;field] ...
1220 * where 'field' = type field_name
1221 */
4b147936 1222
7bbab38d
MH		 1223 if (name[0] == '\0' || argc < 1)
1224 return -EINVAL;
1225
1226 mutex_lock(&event_mutex);
4b147936
TZ		 1227
1228 event = find_synth_event(name);
1229 if (event) {
7bbab38d 1230 ret = -EEXIST;
4b147936 1231 goto out;
18858511 1232 }
4b147936 1233
7bbab38d 1234 for (i = 0; i < argc - 1; i++) {
4b147936
TZ		 1235 if (strcmp(argv[i], ";") == 0)
1236 continue;
1237 if (n_fields == SYNTH_FIELDS_MAX) {
1238 ret = -EINVAL;
1239 goto err;
1240 }
1241
282447ba 1242 field = parse_synth_field(argc - i, &argv[i], &consumed);
4b147936
TZ		 1243 if (IS_ERR(field)) {
1244 ret = PTR_ERR(field);
1245 goto err;
1246 }
282447ba
MH		 1247 fields[n_fields++] = field;
1248 i += consumed - 1;
4b147936
TZ		 1249 }
1250
a360d9e4 1251 if (i < argc && strcmp(argv[i], ";") != 0) {
4b147936
TZ		 1252 ret = -EINVAL;
1253 goto err;
1254 }
1255
1256 event = alloc_synth_event(name, n_fields, fields);
1257 if (IS_ERR(event)) {
1258 ret = PTR_ERR(event);
1259 event = NULL;
1260 goto err;
1261 }
faacb361
MH		 1262 ret = register_synth_event(event);
1263 if (!ret)
7bbab38d 1264 dyn_event_add(&event->devent);
faacb361
MH		 1265 else
1266 free_synth_event(event);
4b147936 1267 out:
fc800a10 1268 mutex_unlock(&event_mutex);
4b147936
TZ		 1269
1270 return ret;
1271 err:
4b147936
TZ		 1272 for (i = 0; i < n_fields; i++)
1273 free_synth_field(fields[i]);
4b147936 1274
faacb361 1275 goto out;
4b147936
TZ		 1276}
1277
7bbab38d 1278static int create_or_delete_synth_event(int argc, char **argv)
4b147936 1279{
7bbab38d
MH		 1280 const char *name = argv[0];
1281 struct synth_event *event = NULL;
1282 int ret;
4b147936 1283
7bbab38d
MH		 1284 /* trace_run_command() ensures argc != 0 */
1285 if (name[0] == '!') {
1286 mutex_lock(&event_mutex);
7bbab38d
MH		 1287 event = find_synth_event(name + 1);
1288 if (event) {
1289 if (event->ref)
1290 ret = -EBUSY;
1291 else {
1292 ret = unregister_synth_event(event);
1293 if (!ret) {
1294 dyn_event_remove(&event->devent);
1295 free_synth_event(event);
1296 }
1297 }
faacb361 1298 } else
7bbab38d 1299 ret = -ENOENT;
7bbab38d
MH		 1300 mutex_unlock(&event_mutex);
1301 return ret;
4b147936
TZ		 1302 }
1303
7bbab38d
MH		 1304 ret = __create_synth_event(argc - 1, name, (const char **)argv + 1);
1305 return ret == -ECANCELED ? -EINVAL : ret;
4b147936
TZ		 1306}
1307
7bbab38d 1308static int synth_event_create(int argc, const char **argv)
4b147936 1309{
7bbab38d
MH		 1310 const char *name = argv[0];
1311 int len;
4b147936 1312
7bbab38d
MH		 1313 if (name[0] != 's' || name[1] != ':')
1314 return -ECANCELED;
1315 name += 2;
4b147936 1316
7bbab38d
MH		 1317 /* This interface accepts group name prefix */
1318 if (strchr(name, '/')) {
ed581aaf
TZ		 1319 len = str_has_prefix(name, SYNTH_SYSTEM "/");
1320 if (len == 0)
7bbab38d
MH		 1321 return -EINVAL;
1322 name += len;
1323 }
1324 return __create_synth_event(argc - 1, name, argv + 1);
4b147936
TZ		 1325}
1326
7bbab38d 1327static int synth_event_release(struct dyn_event *ev)
4b147936 1328{
7bbab38d
MH		 1329 struct synth_event *event = to_synth_event(ev);
1330 int ret;
1331
1332 if (event->ref)
1333 return -EBUSY;
1334
1335 ret = unregister_synth_event(event);
1336 if (ret)
1337 return ret;
1338
1339 dyn_event_remove(ev);
1340 free_synth_event(event);
1341 return 0;
4b147936
TZ		 1342}
1343
7bbab38d 1344static int __synth_event_show(struct seq_file *m, struct synth_event *event)
4b147936
TZ		 1345{
1346 struct synth_field *field;
4b147936
TZ		 1347 unsigned int i;
1348
1349 seq_printf(m, "%s\t", event->name);
1350
1351 for (i = 0; i < event->n_fields; i++) {
1352 field = event->fields[i];
1353
1354 /* parameter values */
1355 seq_printf(m, "%s %s%s", field->type, field->name,
1356 i == event->n_fields - 1 ? "" : "; ");
1357 }
1358
1359 seq_putc(m, '\n');
1360
1361 return 0;
1362}
1363
7bbab38d
MH		 1364static int synth_event_show(struct seq_file *m, struct dyn_event *ev)
1365{
1366 struct synth_event *event = to_synth_event(ev);
1367
1368 seq_printf(m, "s:%s/", event->class.system);
1369
1370 return __synth_event_show(m, event);
1371}
1372
1373static int synth_events_seq_show(struct seq_file *m, void *v)
1374{
1375 struct dyn_event *ev = v;
1376
1377 if (!is_synth_event(ev))
1378 return 0;
1379
1380 return __synth_event_show(m, to_synth_event(ev));
1381}
1382
4b147936 1383static const struct seq_operations synth_events_seq_op = {
7bbab38d
MH		 1384 .start = dyn_event_seq_start,
1385 .next = dyn_event_seq_next,
1386 .stop = dyn_event_seq_stop,
1387 .show = synth_events_seq_show,
4b147936
TZ		 1388};
1389
1390static int synth_events_open(struct inode *inode, struct file *file)
1391{
1392 int ret;
1393
1394 if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) {
7bbab38d 1395 ret = dyn_events_release_all(&synth_event_ops);
4b147936
TZ		 1396 if (ret < 0)
1397 return ret;
1398 }
1399
1400 return seq_open(file, &synth_events_seq_op);
1401}
1402
1403static ssize_t synth_events_write(struct file *file,
1404 const char __user *buffer,
1405 size_t count, loff_t *ppos)
1406{
1407 return trace_parse_run_command(file, buffer, count, ppos,
7bbab38d 1408 create_or_delete_synth_event);
4b147936
TZ		 1409}
1410
1411static const struct file_operations synth_events_fops = {
1412 .open = synth_events_open,
1413 .write = synth_events_write,
1414 .read = seq_read,
1415 .llseek = seq_lseek,
1416 .release = seq_release,
1417};
1418
df35d93b
TZ		 1419static u64 hist_field_timestamp(struct hist_field *hist_field,
1420 struct tracing_map_elt *elt,
1421 struct ring_buffer_event *rbe,
1422 void *event)
860f9f6b
TZ		 1423{
1424 struct hist_trigger_data *hist_data = hist_field->hist_data;
1425 struct trace_array *tr = hist_data->event_file->tr;
1426
1427 u64 ts = ring_buffer_event_time_stamp(rbe);
1428
1429 if (hist_data->attrs->ts_in_usecs && trace_clock_in_ns(tr))
1430 ts = ns2usecs(ts);
1431
1432 return ts;
1433}
1434
8b7622bf
TZ		 1435static u64 hist_field_cpu(struct hist_field *hist_field,
1436 struct tracing_map_elt *elt,
1437 struct ring_buffer_event *rbe,
1438 void *event)
1439{
1440 int cpu = smp_processor_id();
1441
1442 return cpu;
1443}
1444
de40f033
TZ		 1445/**
1446 * check_field_for_var_ref - Check if a VAR_REF field references a variable
1447 * @hist_field: The VAR_REF field to check
1448 * @var_data: The hist trigger that owns the variable
1449 * @var_idx: The trigger variable identifier
1450 *
1451 * Check the given VAR_REF field to see whether or not it references
1452 * the given variable associated with the given trigger.
1453 *
1454 * Return: The VAR_REF field if it does reference the variable, NULL if not
1455 */
067fe038
TZ		 1456static struct hist_field *
1457check_field_for_var_ref(struct hist_field *hist_field,
1458 struct hist_trigger_data *var_data,
1459 unsigned int var_idx)
1460{
e4f6d245 1461 WARN_ON(!(hist_field && hist_field->flags & HIST_FIELD_FL_VAR_REF));
067fe038 1462
e4f6d245
TZ		 1463 if (hist_field && hist_field->var.idx == var_idx &&
1464 hist_field->var.hist_data == var_data)
1465 return hist_field;
067fe038 1466
e4f6d245 1467 return NULL;
067fe038
TZ		 1468}
1469
de40f033
TZ		 1470/**
1471 * find_var_ref - Check if a trigger has a reference to a trigger variable
1472 * @hist_data: The hist trigger that might have a reference to the variable
1473 * @var_data: The hist trigger that owns the variable
1474 * @var_idx: The trigger variable identifier
1475 *
1476 * Check the list of var_refs[] on the first hist trigger to see
1477 * whether any of them are references to the variable on the second
1478 * trigger.
1479 *
1480 * Return: The VAR_REF field referencing the variable if so, NULL if not
1481 */
067fe038
TZ		 1482static struct hist_field *find_var_ref(struct hist_trigger_data *hist_data,
1483 struct hist_trigger_data *var_data,
1484 unsigned int var_idx)
1485{
e4f6d245 1486 struct hist_field *hist_field;
067fe038
TZ		 1487 unsigned int i;
1488
e4f6d245
TZ		 1489 for (i = 0; i < hist_data->n_var_refs; i++) {
1490 hist_field = hist_data->var_refs[i];
1491 if (check_field_for_var_ref(hist_field, var_data, var_idx))
1492 return hist_field;
067fe038
TZ		 1493 }
1494
e4f6d245 1495 return NULL;
067fe038
TZ		 1496}
1497
de40f033
TZ		 1498/**
1499 * find_any_var_ref - Check if there is a reference to a given trigger variable
1500 * @hist_data: The hist trigger
1501 * @var_idx: The trigger variable identifier
1502 *
1503 * Check to see whether the given variable is currently referenced by
1504 * any other trigger.
1505 *
1506 * The trigger the variable is defined on is explicitly excluded - the
1507 * assumption being that a self-reference doesn't prevent a trigger
1508 * from being removed.
1509 *
1510 * Return: The VAR_REF field referencing the variable if so, NULL if not
1511 */
067fe038
TZ		 1512static struct hist_field *find_any_var_ref(struct hist_trigger_data *hist_data,
1513 unsigned int var_idx)
1514{
1515 struct trace_array *tr = hist_data->event_file->tr;
1516 struct hist_field *found = NULL;
1517 struct hist_var_data *var_data;
1518
1519 list_for_each_entry(var_data, &tr->hist_vars, list) {
1520 if (var_data->hist_data == hist_data)
1521 continue;
1522 found = find_var_ref(var_data->hist_data, hist_data, var_idx);
1523 if (found)
1524 break;
1525 }
1526
1527 return found;
1528}
1529
de40f033
TZ		 1530/**
1531 * check_var_refs - Check if there is a reference to any of trigger's variables
1532 * @hist_data: The hist trigger
1533 *
1534 * A trigger can define one or more variables. If any one of them is
1535 * currently referenced by any other trigger, this function will
1536 * determine that.
1537
1538 * Typically used to determine whether or not a trigger can be removed
1539 * - if there are any references to a trigger's variables, it cannot.
1540 *
1541 * Return: True if there is a reference to any of trigger's variables
1542 */
067fe038
TZ		 1543static bool check_var_refs(struct hist_trigger_data *hist_data)
1544{
1545 struct hist_field *field;
1546 bool found = false;
1547 int i;
1548
1549 for_each_hist_field(i, hist_data) {
1550 field = hist_data->fields[i];
1551 if (field && field->flags & HIST_FIELD_FL_VAR) {
1552 if (find_any_var_ref(hist_data, field->var.idx)) {
1553 found = true;
1554 break;
1555 }
1556 }
1557 }
1558
1559 return found;
1560}
1561
1562static struct hist_var_data *find_hist_vars(struct hist_trigger_data *hist_data)
1563{
1564 struct trace_array *tr = hist_data->event_file->tr;
1565 struct hist_var_data *var_data, *found = NULL;
1566
1567 list_for_each_entry(var_data, &tr->hist_vars, list) {
1568 if (var_data->hist_data == hist_data) {
1569 found = var_data;
1570 break;
1571 }
1572 }
1573
1574 return found;
1575}
1576
1577static bool field_has_hist_vars(struct hist_field *hist_field,
1578 unsigned int level)
1579{
1580 int i;
1581
1582 if (level > 3)
1583 return false;
1584
1585 if (!hist_field)
1586 return false;
1587
1588 if (hist_field->flags & HIST_FIELD_FL_VAR ||
1589 hist_field->flags & HIST_FIELD_FL_VAR_REF)
1590 return true;
1591
1592 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) {
1593 struct hist_field *operand;
1594
1595 operand = hist_field->operands[i];
1596 if (field_has_hist_vars(operand, level + 1))
1597 return true;
1598 }
1599
1600 return false;
1601}
1602
1603static bool has_hist_vars(struct hist_trigger_data *hist_data)
1604{
1605 struct hist_field *hist_field;
1606 int i;
1607
1608 for_each_hist_field(i, hist_data) {
1609 hist_field = hist_data->fields[i];
1610 if (field_has_hist_vars(hist_field, 0))
1611 return true;
1612 }
1613
1614 return false;
1615}
1616
1617static int save_hist_vars(struct hist_trigger_data *hist_data)
1618{
1619 struct trace_array *tr = hist_data->event_file->tr;
1620 struct hist_var_data *var_data;
1621
1622 var_data = find_hist_vars(hist_data);
1623 if (var_data)
1624 return 0;
1625
1626 if (trace_array_get(tr) < 0)
1627 return -ENODEV;
1628
1629 var_data = kzalloc(sizeof(*var_data), GFP_KERNEL);
1630 if (!var_data) {
1631 trace_array_put(tr);
1632 return -ENOMEM;
1633 }
1634
1635 var_data->hist_data = hist_data;
1636 list_add(&var_data->list, &tr->hist_vars);
1637
1638 return 0;
1639}
1640
1641static void remove_hist_vars(struct hist_trigger_data *hist_data)
1642{
1643 struct trace_array *tr = hist_data->event_file->tr;
1644 struct hist_var_data *var_data;
1645
1646 var_data = find_hist_vars(hist_data);
1647 if (!var_data)
1648 return;
1649
1650 if (WARN_ON(check_var_refs(hist_data)))
1651 return;
1652
1653 list_del(&var_data->list);
1654
1655 kfree(var_data);
1656
1657 trace_array_put(tr);
1658}
1659
30350d65
TZ		 1660static struct hist_field *find_var_field(struct hist_trigger_data *hist_data,
1661 const char *var_name)
1662{
1663 struct hist_field *hist_field, *found = NULL;
1664 int i;
1665
1666 for_each_hist_field(i, hist_data) {
1667 hist_field = hist_data->fields[i];
1668 if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR &&
1669 strcmp(hist_field->var.name, var_name) == 0) {
1670 found = hist_field;
1671 break;
1672 }
1673 }
1674
1675 return found;
1676}
1677
1678static struct hist_field *find_var(struct hist_trigger_data *hist_data,
1679 struct trace_event_file *file,
1680 const char *var_name)
1681{
1682 struct hist_trigger_data *test_data;
1683 struct event_trigger_data *test;
1684 struct hist_field *hist_field;
1685
1686 hist_field = find_var_field(hist_data, var_name);
1687 if (hist_field)
1688 return hist_field;
1689
1690 list_for_each_entry_rcu(test, &file->triggers, list) {
1691 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
1692 test_data = test->private_data;
1693 hist_field = find_var_field(test_data, var_name);
1694 if (hist_field)
1695 return hist_field;
1696 }
1697 }
1698
1699 return NULL;
1700}
1701
067fe038
TZ		 1702static struct trace_event_file *find_var_file(struct trace_array *tr,
1703 char *system,
1704 char *event_name,
1705 char *var_name)
1706{
1707 struct hist_trigger_data *var_hist_data;
1708 struct hist_var_data *var_data;
1709 struct trace_event_file *file, *found = NULL;
1710
1711 if (system)
1712 return find_event_file(tr, system, event_name);
1713
1714 list_for_each_entry(var_data, &tr->hist_vars, list) {
1715 var_hist_data = var_data->hist_data;
1716 file = var_hist_data->event_file;
1717 if (file == found)
1718 continue;
1719
1720 if (find_var_field(var_hist_data, var_name)) {
f404da6e
TZ		 1721 if (found) {
1722 hist_err_event("Variable name not unique, need to use fully qualified name (subsys.event.var) for variable: ", system, event_name, var_name);
067fe038 1723 return NULL;
f404da6e 1724 }
067fe038
TZ		 1725
1726 found = file;
1727 }
1728 }
1729
1730 return found;
1731}
1732
1733static struct hist_field *find_file_var(struct trace_event_file *file,
1734 const char *var_name)
1735{
1736 struct hist_trigger_data *test_data;
1737 struct event_trigger_data *test;
1738 struct hist_field *hist_field;
1739
1740 list_for_each_entry_rcu(test, &file->triggers, list) {
1741 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
1742 test_data = test->private_data;
1743 hist_field = find_var_field(test_data, var_name);
1744 if (hist_field)
1745 return hist_field;
1746 }
1747 }
1748
1749 return NULL;
1750}
1751
c282a386
TZ		 1752static struct hist_field *
1753find_match_var(struct hist_trigger_data *hist_data, char *var_name)
1754{
1755 struct trace_array *tr = hist_data->event_file->tr;
1756 struct hist_field *hist_field, *found = NULL;
1757 struct trace_event_file *file;
1758 unsigned int i;
1759
1760 for (i = 0; i < hist_data->n_actions; i++) {
1761 struct action_data *data = hist_data->actions[i];
1762
7d18a10c 1763 if (data->handler == HANDLER_ONMATCH) {
c3e49506
TZ		 1764 char *system = data->match_data.event_system;
1765 char *event_name = data->match_data.event;
c282a386
TZ		 1766
1767 file = find_var_file(tr, system, event_name, var_name);
1768 if (!file)
1769 continue;
1770 hist_field = find_file_var(file, var_name);
1771 if (hist_field) {
1772 if (found) {
f404da6e 1773 hist_err_event("Variable name not unique, need to use fully qualified name (subsys.event.var) for variable: ", system, event_name, var_name);
c282a386
TZ		 1774 return ERR_PTR(-EINVAL);
1775 }
1776
1777 found = hist_field;
1778 }
1779 }
1780 }
1781 return found;
1782}
1783
067fe038
TZ		 1784static struct hist_field *find_event_var(struct hist_trigger_data *hist_data,
1785 char *system,
1786 char *event_name,
1787 char *var_name)
1788{
1789 struct trace_array *tr = hist_data->event_file->tr;
1790 struct hist_field *hist_field = NULL;
1791 struct trace_event_file *file;
1792
c282a386
TZ		 1793 if (!system || !event_name) {
1794 hist_field = find_match_var(hist_data, var_name);
1795 if (IS_ERR(hist_field))
1796 return NULL;
1797 if (hist_field)
1798 return hist_field;
1799 }
1800
067fe038
TZ		 1801 file = find_var_file(tr, system, event_name, var_name);
1802 if (!file)
1803 return NULL;
1804
1805 hist_field = find_file_var(file, var_name);
1806
1807 return hist_field;
1808}
1809
067fe038
TZ		 1810static u64 hist_field_var_ref(struct hist_field *hist_field,
1811 struct tracing_map_elt *elt,
1812 struct ring_buffer_event *rbe,
1813 void *event)
1814{
1815 struct hist_elt_data *elt_data;
1816 u64 var_val = 0;
1817
1818 elt_data = elt->private_data;
1819 var_val = elt_data->var_ref_vals[hist_field->var_ref_idx];
1820
1821 return var_val;
1822}
1823
1824static bool resolve_var_refs(struct hist_trigger_data *hist_data, void *key,
1825 u64 *var_ref_vals, bool self)
1826{
1827 struct hist_trigger_data *var_data;
1828 struct tracing_map_elt *var_elt;
1829 struct hist_field *hist_field;
1830 unsigned int i, var_idx;
1831 bool resolved = true;
1832 u64 var_val = 0;
1833
1834 for (i = 0; i < hist_data->n_var_refs; i++) {
1835 hist_field = hist_data->var_refs[i];
1836 var_idx = hist_field->var.idx;
1837 var_data = hist_field->var.hist_data;
1838
1839 if (var_data == NULL) {
1840 resolved = false;
1841 break;
1842 }
1843
1844 if ((self && var_data != hist_data) ||
1845 (!self && var_data == hist_data))
1846 continue;
1847
1848 var_elt = tracing_map_lookup(var_data->map, key);
1849 if (!var_elt) {
1850 resolved = false;
1851 break;
1852 }
1853
1854 if (!tracing_map_var_set(var_elt, var_idx)) {
1855 resolved = false;
1856 break;
1857 }
1858
1859 if (self || !hist_field->read_once)
1860 var_val = tracing_map_read_var(var_elt, var_idx);
1861 else
1862 var_val = tracing_map_read_var_once(var_elt, var_idx);
1863
1864 var_ref_vals[i] = var_val;
1865 }
1866
1867 return resolved;
1868}
1869
85013256
TZ		 1870static const char *hist_field_name(struct hist_field *field,
1871 unsigned int level)
1872{
1873 const char *field_name = "";
1874
1875 if (level > 1)
1876 return field_name;
1877
1878 if (field->field)
1879 field_name = field->field->name;
7e8b88a3
TZ		 1880 else if (field->flags & HIST_FIELD_FL_LOG2 ||
1881 field->flags & HIST_FIELD_FL_ALIAS)
5819eadd 1882 field_name = hist_field_name(field->operands[0], ++level);
8b7622bf
TZ		 1883 else if (field->flags & HIST_FIELD_FL_CPU)
1884 field_name = "cpu";
067fe038
TZ		 1885 else if (field->flags & HIST_FIELD_FL_EXPR ||
1886 field->flags & HIST_FIELD_FL_VAR_REF) {
1887 if (field->system) {
1888 static char full_name[MAX_FILTER_STR_VAL];
1889
1890 strcat(full_name, field->system);
1891 strcat(full_name, ".");
1892 strcat(full_name, field->event_name);
1893 strcat(full_name, ".");
1894 strcat(full_name, field->name);
1895 field_name = full_name;
1896 } else
1897 field_name = field->name;
0ae7961e
TZ		 1898 } else if (field->flags & HIST_FIELD_FL_TIMESTAMP)
1899 field_name = "common_timestamp";
85013256
TZ		 1900
1901 if (field_name == NULL)
1902 field_name = "";
1903
1904 return field_name;
1905}
1906
7ef224d1
TZ		 1907static hist_field_fn_t select_value_fn(int field_size, int field_is_signed)
1908{
1909 hist_field_fn_t fn = NULL;
1910
1911 switch (field_size) {
1912 case 8:
1913 if (field_is_signed)
1914 fn = hist_field_s64;
1915 else
1916 fn = hist_field_u64;
1917 break;
1918 case 4:
1919 if (field_is_signed)
1920 fn = hist_field_s32;
1921 else
1922 fn = hist_field_u32;
1923 break;
1924 case 2:
1925 if (field_is_signed)
1926 fn = hist_field_s16;
1927 else
1928 fn = hist_field_u16;
1929 break;
1930 case 1:
1931 if (field_is_signed)
1932 fn = hist_field_s8;
1933 else
1934 fn = hist_field_u8;
1935 break;
1936 }
1937
1938 return fn;
1939}
1940
1941static int parse_map_size(char *str)
1942{
1943 unsigned long size, map_bits;
1944 int ret;
1945
1946 strsep(&str, "=");
1947 if (!str) {
1948 ret = -EINVAL;
1949 goto out;
1950 }
1951
1952 ret = kstrtoul(str, 0, &size);
1953 if (ret)
1954 goto out;
1955
1956 map_bits = ilog2(roundup_pow_of_two(size));
1957 if (map_bits < TRACING_MAP_BITS_MIN ||
1958 map_bits > TRACING_MAP_BITS_MAX)
1959 ret = -EINVAL;
1960 else
1961 ret = map_bits;
1962 out:
1963 return ret;
1964}
1965
1966static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs)
1967{
30350d65
TZ		 1968 unsigned int i;
1969
7ef224d1
TZ		 1970 if (!attrs)
1971 return;
1972
30350d65
TZ		 1973 for (i = 0; i < attrs->n_assignments; i++)
1974 kfree(attrs->assignment_str[i]);
1975
0212e2aa
TZ		 1976 for (i = 0; i < attrs->n_actions; i++)
1977 kfree(attrs->action_str[i]);
1978
5463bfda 1979 kfree(attrs->name);
e62347d2 1980 kfree(attrs->sort_key_str);
7ef224d1 1981 kfree(attrs->keys_str);
f2606835 1982 kfree(attrs->vals_str);
a4072fe8 1983 kfree(attrs->clock);
7ef224d1
TZ		 1984 kfree(attrs);
1985}
1986
0212e2aa
TZ		 1987static int parse_action(char *str, struct hist_trigger_attrs *attrs)
1988{
c282a386 1989 int ret = -EINVAL;
0212e2aa
TZ		 1990
1991 if (attrs->n_actions >= HIST_ACTIONS_MAX)
1992 return ret;
1993
754481e6 1994 if ((str_has_prefix(str, "onmatch(")) ||
dff81f55
TZ		 1995 (str_has_prefix(str, "onmax(")) ||
1996 (str_has_prefix(str, "onchange("))) {
c282a386
TZ		 1997 attrs->action_str[attrs->n_actions] = kstrdup(str, GFP_KERNEL);
1998 if (!attrs->action_str[attrs->n_actions]) {
1999 ret = -ENOMEM;
2000 return ret;
2001 }
2002 attrs->n_actions++;
2003 ret = 0;
2004 }
2005
0212e2aa
TZ		 2006 return ret;
2007}
2008
9b1ae035
TZ		 2009static int parse_assignment(char *str, struct hist_trigger_attrs *attrs)
2010{
2011 int ret = 0;
2012
754481e6
SRV		 2013 if ((str_has_prefix(str, "key=")) ||
2014 (str_has_prefix(str, "keys="))) {
9b1ae035
TZ		 2015 attrs->keys_str = kstrdup(str, GFP_KERNEL);
2016 if (!attrs->keys_str) {
2017 ret = -ENOMEM;
2018 goto out;
2019 }
754481e6
SRV		 2020 } else if ((str_has_prefix(str, "val=")) ||
2021 (str_has_prefix(str, "vals=")) ||
2022 (str_has_prefix(str, "values="))) {
9b1ae035
TZ		 2023 attrs->vals_str = kstrdup(str, GFP_KERNEL);
2024 if (!attrs->vals_str) {
2025 ret = -ENOMEM;
2026 goto out;
2027 }
754481e6 2028 } else if (str_has_prefix(str, "sort=")) {
9b1ae035
TZ		 2029 attrs->sort_key_str = kstrdup(str, GFP_KERNEL);
2030 if (!attrs->sort_key_str) {
2031 ret = -ENOMEM;
2032 goto out;
2033 }
754481e6 2034 } else if (str_has_prefix(str, "name=")) {
9b1ae035
TZ		 2035 attrs->name = kstrdup(str, GFP_KERNEL);
2036 if (!attrs->name) {
2037 ret = -ENOMEM;
2038 goto out;
2039 }
754481e6 2040 } else if (str_has_prefix(str, "clock=")) {
a4072fe8
TZ		 2041 strsep(&str, "=");
2042 if (!str) {
2043 ret = -EINVAL;
2044 goto out;
2045 }
2046
2047 str = strstrip(str);
2048 attrs->clock = kstrdup(str, GFP_KERNEL);
2049 if (!attrs->clock) {
2050 ret = -ENOMEM;
2051 goto out;
2052 }
754481e6 2053 } else if (str_has_prefix(str, "size=")) {
9b1ae035
TZ		 2054 int map_bits = parse_map_size(str);
2055
2056 if (map_bits < 0) {
2057 ret = map_bits;
2058 goto out;
2059 }
2060 attrs->map_bits = map_bits;
30350d65
TZ		 2061 } else {
2062 char *assignment;
2063
2064 if (attrs->n_assignments == TRACING_MAP_VARS_MAX) {
f404da6e 2065 hist_err("Too many variables defined: ", str);
30350d65
TZ		 2066 ret = -EINVAL;
2067 goto out;
2068 }
2069
2070 assignment = kstrdup(str, GFP_KERNEL);
2071 if (!assignment) {
2072 ret = -ENOMEM;
2073 goto out;
2074 }
2075
2076 attrs->assignment_str[attrs->n_assignments++] = assignment;
2077 }
9b1ae035
TZ		 2078 out:
2079 return ret;
2080}
2081
7ef224d1
TZ		 2082static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str)
2083{
2084 struct hist_trigger_attrs *attrs;
2085 int ret = 0;
2086
2087 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
2088 if (!attrs)
2089 return ERR_PTR(-ENOMEM);
2090
2091 while (trigger_str) {
2092 char *str = strsep(&trigger_str, ":");
2093
9b1ae035
TZ		 2094 if (strchr(str, '=')) {
2095 ret = parse_assignment(str, attrs);
2096 if (ret)
2097 goto free;
2098 } else if (strcmp(str, "pause") == 0)
83e99914
TZ		 2099 attrs->pause = true;
2100 else if ((strcmp(str, "cont") == 0) ||
2101 (strcmp(str, "continue") == 0))
2102 attrs->cont = true;
e86ae9ba
TZ		 2103 else if (strcmp(str, "clear") == 0)
2104 attrs->clear = true;
9b1ae035 2105 else {
0212e2aa
TZ		 2106 ret = parse_action(str, attrs);
2107 if (ret)
2108 goto free;
7ef224d1
TZ		 2109 }
2110 }
2111
2112 if (!attrs->keys_str) {
2113 ret = -EINVAL;
2114 goto free;
2115 }
2116
a4072fe8
TZ		 2117 if (!attrs->clock) {
2118 attrs->clock = kstrdup("global", GFP_KERNEL);
2119 if (!attrs->clock) {
2120 ret = -ENOMEM;
2121 goto free;
2122 }
2123 }
2124
7ef224d1
TZ		 2125 return attrs;
2126 free:
2127 destroy_hist_trigger_attrs(attrs);
2128
2129 return ERR_PTR(ret);
2130}
2131
6b4827ad
TZ		 2132static inline void save_comm(char *comm, struct task_struct *task)
2133{
2134 if (!task->pid) {
2135 strcpy(comm, "<idle>");
2136 return;
2137 }
2138
2139 if (WARN_ON_ONCE(task->pid < 0)) {
2140 strcpy(comm, "<XXX>");
2141 return;
2142 }
2143
27242c62 2144 strncpy(comm, task->comm, TASK_COMM_LEN);
6b4827ad
TZ		 2145}
2146
af6a29bc
TZ		 2147static void hist_elt_data_free(struct hist_elt_data *elt_data)
2148{
02205a67
TZ		 2149 unsigned int i;
2150
2151 for (i = 0; i < SYNTH_FIELDS_MAX; i++)
2152 kfree(elt_data->field_var_str[i]);
2153
af6a29bc
TZ		 2154 kfree(elt_data->comm);
2155 kfree(elt_data);
2156}
2157
2158static void hist_trigger_elt_data_free(struct tracing_map_elt *elt)
6b4827ad 2159{
af6a29bc
TZ		 2160 struct hist_elt_data *elt_data = elt->private_data;
2161
2162 hist_elt_data_free(elt_data);
6b4827ad
TZ		 2163}
2164
af6a29bc 2165static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt)
6b4827ad
TZ		 2166{
2167 struct hist_trigger_data *hist_data = elt->map->private_data;
af6a29bc
TZ		 2168 unsigned int size = TASK_COMM_LEN;
2169 struct hist_elt_data *elt_data;
6b4827ad 2170 struct hist_field *key_field;
02205a67 2171 unsigned int i, n_str;
6b4827ad 2172
af6a29bc
TZ		 2173 elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
2174 if (!elt_data)
2175 return -ENOMEM;
2176
6b4827ad
TZ		 2177 for_each_hist_key_field(i, hist_data) {
2178 key_field = hist_data->fields[i];
2179
2180 if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
af6a29bc
TZ		 2181 elt_data->comm = kzalloc(size, GFP_KERNEL);
2182 if (!elt_data->comm) {
2183 kfree(elt_data);
6b4827ad 2184 return -ENOMEM;
af6a29bc 2185 }
6b4827ad
TZ		 2186 break;
2187 }
2188 }
2189
7d18a10c 2190 n_str = hist_data->n_field_var_str + hist_data->n_save_var_str;
02205a67
TZ		 2191
2192 size = STR_VAR_LEN_MAX;
2193
2194 for (i = 0; i < n_str; i++) {
2195 elt_data->field_var_str[i] = kzalloc(size, GFP_KERNEL);
2196 if (!elt_data->field_var_str[i]) {
2197 hist_elt_data_free(elt_data);
2198 return -ENOMEM;
2199 }
2200 }
2201
af6a29bc
TZ		 2202 elt->private_data = elt_data;
2203
6b4827ad
TZ		 2204 return 0;
2205}
2206
af6a29bc 2207static void hist_trigger_elt_data_init(struct tracing_map_elt *elt)
6b4827ad 2208{
af6a29bc 2209 struct hist_elt_data *elt_data = elt->private_data;
6b4827ad 2210
af6a29bc
TZ		 2211 if (elt_data->comm)
2212 save_comm(elt_data->comm, current);
6b4827ad
TZ		 2213}
2214
af6a29bc
TZ		 2215static const struct tracing_map_ops hist_trigger_elt_data_ops = {
2216 .elt_alloc = hist_trigger_elt_data_alloc,
2217 .elt_free = hist_trigger_elt_data_free,
2218 .elt_init = hist_trigger_elt_data_init,
6b4827ad
TZ		 2219};
2220
2ece94fb
TZ		 2221static const char *get_hist_field_flags(struct hist_field *hist_field)
2222{
2223 const char *flags_str = NULL;
2224
2225 if (hist_field->flags & HIST_FIELD_FL_HEX)
2226 flags_str = "hex";
2227 else if (hist_field->flags & HIST_FIELD_FL_SYM)
2228 flags_str = "sym";
2229 else if (hist_field->flags & HIST_FIELD_FL_SYM_OFFSET)
2230 flags_str = "sym-offset";
2231 else if (hist_field->flags & HIST_FIELD_FL_EXECNAME)
2232 flags_str = "execname";
2233 else if (hist_field->flags & HIST_FIELD_FL_SYSCALL)
2234 flags_str = "syscall";
2235 else if (hist_field->flags & HIST_FIELD_FL_LOG2)
2236 flags_str = "log2";
2237 else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP_USECS)
2238 flags_str = "usecs";
2239
2240 return flags_str;
2241}
2242
100719dc
TZ		 2243static void expr_field_str(struct hist_field *field, char *expr)
2244{
067fe038
TZ		 2245 if (field->flags & HIST_FIELD_FL_VAR_REF)
2246 strcat(expr, "$");
2247
100719dc
TZ		 2248 strcat(expr, hist_field_name(field, 0));
2249
76690945 2250 if (field->flags && !(field->flags & HIST_FIELD_FL_VAR_REF)) {
100719dc
TZ		 2251 const char *flags_str = get_hist_field_flags(field);
2252
2253 if (flags_str) {
2254 strcat(expr, ".");
2255 strcat(expr, flags_str);
2256 }
2257 }
2258}
2259
2260static char *expr_str(struct hist_field *field, unsigned int level)
2261{
2262 char *expr;
2263
2264 if (level > 1)
2265 return NULL;
2266
2267 expr = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
2268 if (!expr)
2269 return NULL;
2270
2271 if (!field->operands[0]) {
2272 expr_field_str(field, expr);
2273 return expr;
2274 }
2275
2276 if (field->operator == FIELD_OP_UNARY_MINUS) {
2277 char *subexpr;
2278
2279 strcat(expr, "-(");
2280 subexpr = expr_str(field->operands[0], ++level);
2281 if (!subexpr) {
2282 kfree(expr);
2283 return NULL;
2284 }
2285 strcat(expr, subexpr);
2286 strcat(expr, ")");
2287
2288 kfree(subexpr);
2289
2290 return expr;
2291 }
2292
2293 expr_field_str(field->operands[0], expr);
2294
2295 switch (field->operator) {
2296 case FIELD_OP_MINUS:
2297 strcat(expr, "-");
2298 break;
2299 case FIELD_OP_PLUS:
2300 strcat(expr, "+");
2301 break;
2302 default:
2303 kfree(expr);
2304 return NULL;
2305 }
2306
2307 expr_field_str(field->operands[1], expr);
2308
2309 return expr;
2310}
2311
2312static int contains_operator(char *str)
2313{
2314 enum field_op_id field_op = FIELD_OP_NONE;
2315 char *op;
2316
2317 op = strpbrk(str, "+-");
2318 if (!op)
2319 return FIELD_OP_NONE;
2320
2321 switch (*op) {
2322 case '-':
2323 if (*str == '-')
2324 field_op = FIELD_OP_UNARY_MINUS;
2325 else
2326 field_op = FIELD_OP_MINUS;
2327 break;
2328 case '+':
2329 field_op = FIELD_OP_PLUS;
2330 break;
2331 default:
2332 break;
2333 }
2334
2335 return field_op;
2336}
2337
656fe2ba
TZ		 2338static void __destroy_hist_field(struct hist_field *hist_field)
2339{
2340 kfree(hist_field->var.name);
2341 kfree(hist_field->name);
2342 kfree(hist_field->type);
2343
2344 kfree(hist_field);
2345}
2346
5819eadd
TZ		 2347static void destroy_hist_field(struct hist_field *hist_field,
2348 unsigned int level)
7ef224d1 2349{
5819eadd
TZ		 2350 unsigned int i;
2351
100719dc 2352 if (level > 3)
5819eadd
TZ		 2353 return;
2354
2355 if (!hist_field)
2356 return;
2357
656fe2ba
TZ		 2358 if (hist_field->flags & HIST_FIELD_FL_VAR_REF)
2359 return; /* var refs will be destroyed separately */
2360
5819eadd
TZ		 2361 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++)
2362 destroy_hist_field(hist_field->operands[i], level + 1);
2363
656fe2ba 2364 __destroy_hist_field(hist_field);
7ef224d1
TZ		 2365}
2366
b559d003
TZ		 2367static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
2368 struct ftrace_event_field *field,
30350d65
TZ		 2369 unsigned long flags,
2370 char *var_name)
7ef224d1
TZ		 2371{
2372 struct hist_field *hist_field;
2373
2374 if (field && is_function_field(field))
2375 return NULL;
2376
2377 hist_field = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
2378 if (!hist_field)
2379 return NULL;
2380
b559d003
TZ		 2381 hist_field->hist_data = hist_data;
2382
7e8b88a3 2383 if (flags & HIST_FIELD_FL_EXPR || flags & HIST_FIELD_FL_ALIAS)
100719dc
TZ		 2384 goto out; /* caller will populate */
2385
067fe038
TZ		 2386 if (flags & HIST_FIELD_FL_VAR_REF) {
2387 hist_field->fn = hist_field_var_ref;
2388 goto out;
2389 }
2390
7ef224d1
TZ		 2391 if (flags & HIST_FIELD_FL_HITCOUNT) {
2392 hist_field->fn = hist_field_counter;
19a9facd
TZ		 2393 hist_field->size = sizeof(u64);
2394 hist_field->type = kstrdup("u64", GFP_KERNEL);
2395 if (!hist_field->type)
2396 goto free;
7ef224d1
TZ		 2397 goto out;
2398 }
2399
69a0200c
TZ		 2400 if (flags & HIST_FIELD_FL_STACKTRACE) {
2401 hist_field->fn = hist_field_none;
2402 goto out;
2403 }
2404
4b94f5b7 2405 if (flags & HIST_FIELD_FL_LOG2) {
5819eadd 2406 unsigned long fl = flags & ~HIST_FIELD_FL_LOG2;
4b94f5b7 2407 hist_field->fn = hist_field_log2;
30350d65 2408 hist_field->operands[0] = create_hist_field(hist_data, field, fl, NULL);
5819eadd 2409 hist_field->size = hist_field->operands[0]->size;
19a9facd
TZ		 2410 hist_field->type = kstrdup(hist_field->operands[0]->type, GFP_KERNEL);
2411 if (!hist_field->type)
2412 goto free;
4b94f5b7
NK		 2413 goto out;
2414 }
2415
ad42febe
TZ		 2416 if (flags & HIST_FIELD_FL_TIMESTAMP) {
2417 hist_field->fn = hist_field_timestamp;
2418 hist_field->size = sizeof(u64);
19a9facd
TZ		 2419 hist_field->type = kstrdup("u64", GFP_KERNEL);
2420 if (!hist_field->type)
2421 goto free;
ad42febe
TZ		 2422 goto out;
2423 }
2424
8b7622bf
TZ		 2425 if (flags & HIST_FIELD_FL_CPU) {
2426 hist_field->fn = hist_field_cpu;
2427 hist_field->size = sizeof(int);
2428 hist_field->type = kstrdup("unsigned int", GFP_KERNEL);
2429 if (!hist_field->type)
2430 goto free;
2431 goto out;
2432 }
2433
432480c5
TZ		 2434 if (WARN_ON_ONCE(!field))
2435 goto out;
2436
7ef224d1
TZ		 2437 if (is_string_field(field)) {
2438 flags |= HIST_FIELD_FL_STRING;
79e577cb 2439
19a9facd
TZ		 2440 hist_field->size = MAX_FILTER_STR_VAL;
2441 hist_field->type = kstrdup(field->type, GFP_KERNEL);
2442 if (!hist_field->type)
2443 goto free;
2444
79e577cb
NK		 2445 if (field->filter_type == FILTER_STATIC_STRING)
2446 hist_field->fn = hist_field_string;
2447 else if (field->filter_type == FILTER_DYN_STRING)
2448 hist_field->fn = hist_field_dynstring;
2449 else
2450 hist_field->fn = hist_field_pstring;
7ef224d1 2451 } else {
19a9facd
TZ		 2452 hist_field->size = field->size;
2453 hist_field->is_signed = field->is_signed;
2454 hist_field->type = kstrdup(field->type, GFP_KERNEL);
2455 if (!hist_field->type)
2456 goto free;
2457
7ef224d1
TZ		 2458 hist_field->fn = select_value_fn(field->size,
2459 field->is_signed);
2460 if (!hist_field->fn) {
5819eadd 2461 destroy_hist_field(hist_field, 0);
7ef224d1
TZ		 2462 return NULL;
2463 }
2464 }
2465 out:
2466 hist_field->field = field;
2467 hist_field->flags = flags;
2468
30350d65
TZ		 2469 if (var_name) {
2470 hist_field->var.name = kstrdup(var_name, GFP_KERNEL);
2471 if (!hist_field->var.name)
2472 goto free;
2473 }
2474
7ef224d1 2475 return hist_field;
30350d65
TZ		 2476 free:
2477 destroy_hist_field(hist_field, 0);
2478 return NULL;
7ef224d1
TZ		 2479}
2480
2481static void destroy_hist_fields(struct hist_trigger_data *hist_data)
2482{
2483 unsigned int i;
2484
30350d65 2485 for (i = 0; i < HIST_FIELDS_MAX; i++) {
7ef224d1 2486 if (hist_data->fields[i]) {
5819eadd 2487 destroy_hist_field(hist_data->fields[i], 0);
7ef224d1
TZ		 2488 hist_data->fields[i] = NULL;
2489 }
2490 }
656fe2ba
TZ		 2491
2492 for (i = 0; i < hist_data->n_var_refs; i++) {
2493 WARN_ON(!(hist_data->var_refs[i]->flags & HIST_FIELD_FL_VAR_REF));
2494 __destroy_hist_field(hist_data->var_refs[i]);
2495 hist_data->var_refs[i] = NULL;
2496 }
7ef224d1
TZ		 2497}
2498
067fe038
TZ		 2499static int init_var_ref(struct hist_field *ref_field,
2500 struct hist_field *var_field,
2501 char *system, char *event_name)
2502{
2503 int err = 0;
2504
2505 ref_field->var.idx = var_field->var.idx;
2506 ref_field->var.hist_data = var_field->hist_data;
2507 ref_field->size = var_field->size;
2508 ref_field->is_signed = var_field->is_signed;
2509 ref_field->flags |= var_field->flags &
2510 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
2511
2512 if (system) {
2513 ref_field->system = kstrdup(system, GFP_KERNEL);
2514 if (!ref_field->system)
2515 return -ENOMEM;
2516 }
2517
2518 if (event_name) {
2519 ref_field->event_name = kstrdup(event_name, GFP_KERNEL);
2520 if (!ref_field->event_name) {
2521 err = -ENOMEM;
2522 goto free;
2523 }
2524 }
2525
7e8b88a3
TZ		 2526 if (var_field->var.name) {
2527 ref_field->name = kstrdup(var_field->var.name, GFP_KERNEL);
2528 if (!ref_field->name) {
2529 err = -ENOMEM;
2530 goto free;
2531 }
2532 } else if (var_field->name) {
2533 ref_field->name = kstrdup(var_field->name, GFP_KERNEL);
2534 if (!ref_field->name) {
2535 err = -ENOMEM;
2536 goto free;
2537 }
067fe038
TZ		 2538 }
2539
2540 ref_field->type = kstrdup(var_field->type, GFP_KERNEL);
2541 if (!ref_field->type) {
2542 err = -ENOMEM;
2543 goto free;
2544 }
2545 out:
2546 return err;
2547 free:
2548 kfree(ref_field->system);
2549 kfree(ref_field->event_name);
2550 kfree(ref_field->name);
2551
2552 goto out;
2553}
2554
de40f033
TZ		 2555/**
2556 * create_var_ref - Create a variable reference and attach it to trigger
2557 * @hist_data: The trigger that will be referencing the variable
2558 * @var_field: The VAR field to create a reference to
2559 * @system: The optional system string
2560 * @event_name: The optional event_name string
2561 *
2562 * Given a variable hist_field, create a VAR_REF hist_field that
2563 * represents a reference to it.
2564 *
2565 * This function also adds the reference to the trigger that
2566 * now references the variable.
2567 *
2568 * Return: The VAR_REF field if successful, NULL if not
2569 */
2570static struct hist_field *create_var_ref(struct hist_trigger_data *hist_data,
2571 struct hist_field *var_field,
067fe038
TZ		 2572 char *system, char *event_name)
2573{
2574 unsigned long flags = HIST_FIELD_FL_VAR_REF;
2575 struct hist_field *ref_field;
2576
2577 ref_field = create_hist_field(var_field->hist_data, NULL, flags, NULL);
2578 if (ref_field) {
2579 if (init_var_ref(ref_field, var_field, system, event_name)) {
2580 destroy_hist_field(ref_field, 0);
2581 return NULL;
2582 }
de40f033
TZ		 2583
2584 hist_data->var_refs[hist_data->n_var_refs] = ref_field;
2585 ref_field->var_ref_idx = hist_data->n_var_refs++;
067fe038
TZ		 2586 }
2587
2588 return ref_field;
2589}
2590
2591static bool is_var_ref(char *var_name)
2592{
2593 if (!var_name || strlen(var_name) < 2 || var_name[0] != '$')
2594 return false;
2595
2596 return true;
2597}
2598
2599static char *field_name_from_var(struct hist_trigger_data *hist_data,
2600 char *var_name)
2601{
2602 char *name, *field;
2603 unsigned int i;
2604
2605 for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) {
2606 name = hist_data->attrs->var_defs.name[i];
2607
2608 if (strcmp(var_name, name) == 0) {
2609 field = hist_data->attrs->var_defs.expr[i];
2610 if (contains_operator(field) || is_var_ref(field))
2611 continue;
2612 return field;
2613 }
2614 }
2615
2616 return NULL;
2617}
2618
2619static char *local_field_var_ref(struct hist_trigger_data *hist_data,
2620 char *system, char *event_name,
2621 char *var_name)
2622{
2623 struct trace_event_call *call;
2624
2625 if (system && event_name) {
2626 call = hist_data->event_file->event_call;
2627
2628 if (strcmp(system, call->class->system) != 0)
2629 return NULL;
2630
2631 if (strcmp(event_name, trace_event_name(call)) != 0)
2632 return NULL;
2633 }
2634
2635 if (!!system != !!event_name)
2636 return NULL;
2637
2638 if (!is_var_ref(var_name))
2639 return NULL;
2640
2641 var_name++;
2642
2643 return field_name_from_var(hist_data, var_name);
2644}
2645
2646static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data,
2647 char *system, char *event_name,
2648 char *var_name)
2649{
2650 struct hist_field *var_field = NULL, *ref_field = NULL;
2651
2652 if (!is_var_ref(var_name))
2653 return NULL;
2654
2655 var_name++;
2656
2657 var_field = find_event_var(hist_data, system, event_name, var_name);
2658 if (var_field)
de40f033
TZ		 2659 ref_field = create_var_ref(hist_data, var_field,
2660 system, event_name);
067fe038 2661
f404da6e
TZ		 2662 if (!ref_field)
2663 hist_err_event("Couldn't find variable: $",
2664 system, event_name, var_name);
2665
067fe038
TZ		 2666 return ref_field;
2667}
2668
100719dc
TZ		 2669static struct ftrace_event_field *
2670parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
2671 char *field_str, unsigned long *flags)
2672{
2673 struct ftrace_event_field *field = NULL;
2674 char *field_name, *modifier, *str;
2675
2676 modifier = str = kstrdup(field_str, GFP_KERNEL);
2677 if (!modifier)
2678 return ERR_PTR(-ENOMEM);
2679
2680 field_name = strsep(&modifier, ".");
2681 if (modifier) {
2682 if (strcmp(modifier, "hex") == 0)
2683 *flags |= HIST_FIELD_FL_HEX;
2684 else if (strcmp(modifier, "sym") == 0)
2685 *flags |= HIST_FIELD_FL_SYM;
2686 else if (strcmp(modifier, "sym-offset") == 0)
2687 *flags |= HIST_FIELD_FL_SYM_OFFSET;
2688 else if ((strcmp(modifier, "execname") == 0) &&
2689 (strcmp(field_name, "common_pid") == 0))
2690 *flags |= HIST_FIELD_FL_EXECNAME;
2691 else if (strcmp(modifier, "syscall") == 0)
2692 *flags |= HIST_FIELD_FL_SYSCALL;
2693 else if (strcmp(modifier, "log2") == 0)
2694 *flags |= HIST_FIELD_FL_LOG2;
2695 else if (strcmp(modifier, "usecs") == 0)
2696 *flags |= HIST_FIELD_FL_TIMESTAMP_USECS;
2697 else {
dcf23457 2698 hist_err("Invalid field modifier: ", modifier);
100719dc
TZ		 2699 field = ERR_PTR(-EINVAL);
2700 goto out;
2701 }
2702 }
2703
2704 if (strcmp(field_name, "common_timestamp") == 0) {
2705 *flags |= HIST_FIELD_FL_TIMESTAMP;
2706 hist_data->enable_timestamps = true;
2707 if (*flags & HIST_FIELD_FL_TIMESTAMP_USECS)
2708 hist_data->attrs->ts_in_usecs = true;
8b7622bf
TZ		 2709 } else if (strcmp(field_name, "cpu") == 0)
2710 *flags |= HIST_FIELD_FL_CPU;
2711 else {
100719dc
TZ		 2712 field = trace_find_event_field(file->event_call, field_name);
2713 if (!field || !field->size) {
5ec432d7 2714 hist_err("Couldn't find field: ", field_name);
100719dc
TZ		 2715 field = ERR_PTR(-EINVAL);
2716 goto out;
2717 }
2718 }
2719 out:
2720 kfree(str);
2721
2722 return field;
2723}
2724
7e8b88a3
TZ		 2725static struct hist_field *create_alias(struct hist_trigger_data *hist_data,
2726 struct hist_field *var_ref,
2727 char *var_name)
2728{
2729 struct hist_field *alias = NULL;
2730 unsigned long flags = HIST_FIELD_FL_ALIAS | HIST_FIELD_FL_VAR;
2731
2732 alias = create_hist_field(hist_data, NULL, flags, var_name);
2733 if (!alias)
2734 return NULL;
2735
2736 alias->fn = var_ref->fn;
2737 alias->operands[0] = var_ref;
2738
2739 if (init_var_ref(alias, var_ref, var_ref->system, var_ref->event_name)) {
2740 destroy_hist_field(alias, 0);
2741 return NULL;
2742 }
2743
2744 return alias;
2745}
2746
100719dc
TZ		 2747static struct hist_field *parse_atom(struct hist_trigger_data *hist_data,
2748 struct trace_event_file *file, char *str,
2749 unsigned long *flags, char *var_name)
2750{
067fe038 2751 char *s, *ref_system = NULL, *ref_event = NULL, *ref_var = str;
100719dc
TZ		 2752 struct ftrace_event_field *field = NULL;
2753 struct hist_field *hist_field = NULL;
2754 int ret = 0;
2755
067fe038
TZ		 2756 s = strchr(str, '.');
2757 if (s) {
2758 s = strchr(++s, '.');
2759 if (s) {
2760 ref_system = strsep(&str, ".");
2761 if (!str) {
2762 ret = -EINVAL;
2763 goto out;
2764 }
2765 ref_event = strsep(&str, ".");
2766 if (!str) {
2767 ret = -EINVAL;
2768 goto out;
2769 }
2770 ref_var = str;
2771 }
2772 }
2773
2774 s = local_field_var_ref(hist_data, ref_system, ref_event, ref_var);
2775 if (!s) {
2776 hist_field = parse_var_ref(hist_data, ref_system, ref_event, ref_var);
2777 if (hist_field) {
7e8b88a3
TZ		 2778 if (var_name) {
2779 hist_field = create_alias(hist_data, hist_field, var_name);
2780 if (!hist_field) {
2781 ret = -ENOMEM;
2782 goto out;
2783 }
2784 }
067fe038
TZ		 2785 return hist_field;
2786 }
2787 } else
2788 str = s;
2789
100719dc
TZ		 2790 field = parse_field(hist_data, file, str, flags);
2791 if (IS_ERR(field)) {
2792 ret = PTR_ERR(field);
2793 goto out;
2794 }
2795
2796 hist_field = create_hist_field(hist_data, field, *flags, var_name);
2797 if (!hist_field) {
2798 ret = -ENOMEM;
2799 goto out;
2800 }
2801
2802 return hist_field;
2803 out:
2804 return ERR_PTR(ret);
2805}
2806
2807static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
2808 struct trace_event_file *file,
2809 char *str, unsigned long flags,
2810 char *var_name, unsigned int level);
2811
2812static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
2813 struct trace_event_file *file,
2814 char *str, unsigned long flags,
2815 char *var_name, unsigned int level)
2816{
2817 struct hist_field *operand1, *expr = NULL;
2818 unsigned long operand_flags;
2819 int ret = 0;
2820 char *s;
2821
2822 /* we support only -(xxx) i.e. explicit parens required */
2823
2824 if (level > 3) {
f404da6e 2825 hist_err("Too many subexpressions (3 max): ", str);
100719dc
TZ		 2826 ret = -EINVAL;
2827 goto free;
2828 }
2829
2830 str++; /* skip leading '-' */
2831
2832 s = strchr(str, '(');
2833 if (s)
2834 str++;
2835 else {
2836 ret = -EINVAL;
2837 goto free;
2838 }
2839
2840 s = strrchr(str, ')');
2841 if (s)
2842 *s = '\0';
2843 else {
2844 ret = -EINVAL; /* no closing ')' */
2845 goto free;
2846 }
2847
2848 flags |= HIST_FIELD_FL_EXPR;
2849 expr = create_hist_field(hist_data, NULL, flags, var_name);
2850 if (!expr) {
2851 ret = -ENOMEM;
2852 goto free;
2853 }
2854
2855 operand_flags = 0;
2856 operand1 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level);
2857 if (IS_ERR(operand1)) {
2858 ret = PTR_ERR(operand1);
2859 goto free;
2860 }
2861
2862 expr->flags |= operand1->flags &
2863 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
2864 expr->fn = hist_field_unary_minus;
2865 expr->operands[0] = operand1;
2866 expr->operator = FIELD_OP_UNARY_MINUS;
2867 expr->name = expr_str(expr, 0);
19a9facd
TZ		 2868 expr->type = kstrdup(operand1->type, GFP_KERNEL);
2869 if (!expr->type) {
2870 ret = -ENOMEM;
2871 goto free;
2872 }
100719dc
TZ		 2873
2874 return expr;
2875 free:
2876 destroy_hist_field(expr, 0);
2877 return ERR_PTR(ret);
2878}
2879
2880static int check_expr_operands(struct hist_field *operand1,
2881 struct hist_field *operand2)
2882{
2883 unsigned long operand1_flags = operand1->flags;
2884 unsigned long operand2_flags = operand2->flags;
2885
7e8b88a3
TZ		 2886 if ((operand1_flags & HIST_FIELD_FL_VAR_REF) ||
2887 (operand1_flags & HIST_FIELD_FL_ALIAS)) {
2888 struct hist_field *var;
2889
2890 var = find_var_field(operand1->var.hist_data, operand1->name);
2891 if (!var)
2892 return -EINVAL;
2893 operand1_flags = var->flags;
2894 }
2895
2896 if ((operand2_flags & HIST_FIELD_FL_VAR_REF) ||
2897 (operand2_flags & HIST_FIELD_FL_ALIAS)) {
2898 struct hist_field *var;
2899
2900 var = find_var_field(operand2->var.hist_data, operand2->name);
2901 if (!var)
2902 return -EINVAL;
2903 operand2_flags = var->flags;
2904 }
2905
100719dc 2906 if ((operand1_flags & HIST_FIELD_FL_TIMESTAMP_USECS) !=
f404da6e
TZ		 2907 (operand2_flags & HIST_FIELD_FL_TIMESTAMP_USECS)) {
2908 hist_err("Timestamp units in expression don't match", NULL);
100719dc 2909 return -EINVAL;
f404da6e 2910 }
100719dc
TZ		 2911
2912 return 0;
2913}
2914
2915static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
2916 struct trace_event_file *file,
2917 char *str, unsigned long flags,
2918 char *var_name, unsigned int level)
2919{
2920 struct hist_field *operand1 = NULL, *operand2 = NULL, *expr = NULL;
2921 unsigned long operand_flags;
2922 int field_op, ret = -EINVAL;
2923 char *sep, *operand1_str;
2924
f404da6e
TZ		 2925 if (level > 3) {
2926 hist_err("Too many subexpressions (3 max): ", str);
100719dc 2927 return ERR_PTR(-EINVAL);
f404da6e 2928 }
100719dc
TZ		 2929
2930 field_op = contains_operator(str);
2931
2932 if (field_op == FIELD_OP_NONE)
2933 return parse_atom(hist_data, file, str, &flags, var_name);
2934
2935 if (field_op == FIELD_OP_UNARY_MINUS)
2936 return parse_unary(hist_data, file, str, flags, var_name, ++level);
2937
2938 switch (field_op) {
2939 case FIELD_OP_MINUS:
2940 sep = "-";
2941 break;
2942 case FIELD_OP_PLUS:
2943 sep = "+";
2944 break;
2945 default:
2946 goto free;
2947 }
2948
2949 operand1_str = strsep(&str, sep);
2950 if (!operand1_str || !str)
2951 goto free;
2952
2953 operand_flags = 0;
2954 operand1 = parse_atom(hist_data, file, operand1_str,
2955 &operand_flags, NULL);
2956 if (IS_ERR(operand1)) {
2957 ret = PTR_ERR(operand1);
2958 operand1 = NULL;
2959 goto free;
2960 }
2961
2962 /* rest of string could be another expression e.g. b+c in a+b+c */
2963 operand_flags = 0;
2964 operand2 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level);
2965 if (IS_ERR(operand2)) {
2966 ret = PTR_ERR(operand2);
2967 operand2 = NULL;
2968 goto free;
2969 }
2970
2971 ret = check_expr_operands(operand1, operand2);
2972 if (ret)
2973 goto free;
2974
2975 flags |= HIST_FIELD_FL_EXPR;
2976
2977 flags |= operand1->flags &
2978 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
2979
2980 expr = create_hist_field(hist_data, NULL, flags, var_name);
2981 if (!expr) {
2982 ret = -ENOMEM;
2983 goto free;
2984 }
2985
067fe038
TZ		 2986 operand1->read_once = true;
2987 operand2->read_once = true;
2988
100719dc
TZ		 2989 expr->operands[0] = operand1;
2990 expr->operands[1] = operand2;
2991 expr->operator = field_op;
2992 expr->name = expr_str(expr, 0);
19a9facd
TZ		 2993 expr->type = kstrdup(operand1->type, GFP_KERNEL);
2994 if (!expr->type) {
2995 ret = -ENOMEM;
2996 goto free;
2997 }
100719dc
TZ		 2998
2999 switch (field_op) {
3000 case FIELD_OP_MINUS:
3001 expr->fn = hist_field_minus;
3002 break;
3003 case FIELD_OP_PLUS:
3004 expr->fn = hist_field_plus;
3005 break;
3006 default:
5e4cf2bf 3007 ret = -EINVAL;
100719dc
TZ		 3008 goto free;
3009 }
3010
3011 return expr;
3012 free:
3013 destroy_hist_field(operand1, 0);
3014 destroy_hist_field(operand2, 0);
3015 destroy_hist_field(expr, 0);
3016
3017 return ERR_PTR(ret);
3018}
3019
02205a67
TZ		 3020static char *find_trigger_filter(struct hist_trigger_data *hist_data,
3021 struct trace_event_file *file)
3022{
3023 struct event_trigger_data *test;
3024
3025 list_for_each_entry_rcu(test, &file->triggers, list) {
3026 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
3027 if (test->private_data == hist_data)
3028 return test->filter_str;
3029 }
3030 }
3031
3032 return NULL;
3033}
3034
3035static struct event_command trigger_hist_cmd;
3036static int event_hist_trigger_func(struct event_command *cmd_ops,
3037 struct trace_event_file *file,
3038 char *glob, char *cmd, char *param);
3039
3040static bool compatible_keys(struct hist_trigger_data *target_hist_data,
3041 struct hist_trigger_data *hist_data,
3042 unsigned int n_keys)
3043{
3044 struct hist_field *target_hist_field, *hist_field;
3045 unsigned int n, i, j;
3046
3047 if (hist_data->n_fields - hist_data->n_vals != n_keys)
3048 return false;
3049
3050 i = hist_data->n_vals;
3051 j = target_hist_data->n_vals;
3052
3053 for (n = 0; n < n_keys; n++) {
3054 hist_field = hist_data->fields[i + n];
3055 target_hist_field = target_hist_data->fields[j + n];
3056
3057 if (strcmp(hist_field->type, target_hist_field->type) != 0)
3058 return false;
3059 if (hist_field->size != target_hist_field->size)
3060 return false;
3061 if (hist_field->is_signed != target_hist_field->is_signed)
3062 return false;
3063 }
3064
3065 return true;
3066}
3067
3068static struct hist_trigger_data *
3069find_compatible_hist(struct hist_trigger_data *target_hist_data,
3070 struct trace_event_file *file)
3071{
3072 struct hist_trigger_data *hist_data;
3073 struct event_trigger_data *test;
3074 unsigned int n_keys;
3075
3076 n_keys = target_hist_data->n_fields - target_hist_data->n_vals;
3077
3078 list_for_each_entry_rcu(test, &file->triggers, list) {
3079 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
3080 hist_data = test->private_data;
3081
3082 if (compatible_keys(target_hist_data, hist_data, n_keys))
3083 return hist_data;
3084 }
3085 }
3086
3087 return NULL;
3088}
3089
3090static struct trace_event_file *event_file(struct trace_array *tr,
3091 char *system, char *event_name)
3092{
3093 struct trace_event_file *file;
3094
3be4c1e5 3095 file = __find_event_file(tr, system, event_name);
02205a67
TZ		 3096 if (!file)
3097 return ERR_PTR(-EINVAL);
3098
3099 return file;
3100}
3101
3102static struct hist_field *
3103find_synthetic_field_var(struct hist_trigger_data *target_hist_data,
3104 char *system, char *event_name, char *field_name)
3105{
3106 struct hist_field *event_var;
3107 char *synthetic_name;
3108
3109 synthetic_name = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
3110 if (!synthetic_name)
3111 return ERR_PTR(-ENOMEM);
3112
3113 strcpy(synthetic_name, "synthetic_");
3114 strcat(synthetic_name, field_name);
3115
3116 event_var = find_event_var(target_hist_data, system, event_name, synthetic_name);
3117
3118 kfree(synthetic_name);
3119
3120 return event_var;
3121}
3122
3123/**
3124 * create_field_var_hist - Automatically create a histogram and var for a field
3125 * @target_hist_data: The target hist trigger
3126 * @subsys_name: Optional subsystem name
3127 * @event_name: Optional event name
3128 * @field_name: The name of the field (and the resulting variable)
3129 *
3130 * Hist trigger actions fetch data from variables, not directly from
3131 * events. However, for convenience, users are allowed to directly
3132 * specify an event field in an action, which will be automatically
3133 * converted into a variable on their behalf.
3134
3135 * If a user specifies a field on an event that isn't the event the
3136 * histogram currently being defined (the target event histogram), the
3137 * only way that can be accomplished is if a new hist trigger is
3138 * created and the field variable defined on that.
3139 *
3140 * This function creates a new histogram compatible with the target
3141 * event (meaning a histogram with the same key as the target
3142 * histogram), and creates a variable for the specified field, but
3143 * with 'synthetic_' prepended to the variable name in order to avoid
3144 * collision with normal field variables.
3145 *
3146 * Return: The variable created for the field.
3147 */
c282a386 3148static struct hist_field *
02205a67
TZ		 3149create_field_var_hist(struct hist_trigger_data *target_hist_data,
3150 char *subsys_name, char *event_name, char *field_name)
3151{
3152 struct trace_array *tr = target_hist_data->event_file->tr;
3153 struct hist_field *event_var = ERR_PTR(-EINVAL);
3154 struct hist_trigger_data *hist_data;
3155 unsigned int i, n, first = true;
3156 struct field_var_hist *var_hist;
3157 struct trace_event_file *file;
3158 struct hist_field *key_field;
3159 char *saved_filter;
3160 char *cmd;
3161 int ret;
3162
f404da6e 3163 if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) {
7d18a10c 3164 hist_err_event("trace action: Too many field variables defined: ",
f404da6e 3165 subsys_name, event_name, field_name);
02205a67 3166 return ERR_PTR(-EINVAL);
f404da6e 3167 }
02205a67
TZ		 3168
3169 file = event_file(tr, subsys_name, event_name);
3170
3171 if (IS_ERR(file)) {
7d18a10c 3172 hist_err_event("trace action: Event file not found: ",
f404da6e 3173 subsys_name, event_name, field_name);
02205a67
TZ		 3174 ret = PTR_ERR(file);
3175 return ERR_PTR(ret);
3176 }
3177
3178 /*
3179 * Look for a histogram compatible with target. We'll use the
3180 * found histogram specification to create a new matching
3181 * histogram with our variable on it. target_hist_data is not
3182 * yet a registered histogram so we can't use that.
3183 */
3184 hist_data = find_compatible_hist(target_hist_data, file);
f404da6e 3185 if (!hist_data) {
7d18a10c 3186 hist_err_event("trace action: Matching event histogram not found: ",
f404da6e 3187 subsys_name, event_name, field_name);
02205a67 3188 return ERR_PTR(-EINVAL);
f404da6e 3189 }
02205a67
TZ		 3190
3191 /* See if a synthetic field variable has already been created */
3192 event_var = find_synthetic_field_var(target_hist_data, subsys_name,
3193 event_name, field_name);
3194 if (!IS_ERR_OR_NULL(event_var))
3195 return event_var;
3196
3197 var_hist = kzalloc(sizeof(*var_hist), GFP_KERNEL);
3198 if (!var_hist)
3199 return ERR_PTR(-ENOMEM);
3200
3201 cmd = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
3202 if (!cmd) {
3203 kfree(var_hist);
3204 return ERR_PTR(-ENOMEM);
3205 }
3206
3207 /* Use the same keys as the compatible histogram */
3208 strcat(cmd, "keys=");
3209
3210 for_each_hist_key_field(i, hist_data) {
3211 key_field = hist_data->fields[i];
3212 if (!first)
3213 strcat(cmd, ",");
3214 strcat(cmd, key_field->field->name);
3215 first = false;
3216 }
3217
3218 /* Create the synthetic field variable specification */
3219 strcat(cmd, ":synthetic_");
3220 strcat(cmd, field_name);
3221 strcat(cmd, "=");
3222 strcat(cmd, field_name);
3223
3224 /* Use the same filter as the compatible histogram */
3225 saved_filter = find_trigger_filter(hist_data, file);
3226 if (saved_filter) {
3227 strcat(cmd, " if ");
3228 strcat(cmd, saved_filter);
3229 }
3230
3231 var_hist->cmd = kstrdup(cmd, GFP_KERNEL);
3232 if (!var_hist->cmd) {
3233 kfree(cmd);
3234 kfree(var_hist);
3235 return ERR_PTR(-ENOMEM);
3236 }
3237
3238 /* Save the compatible histogram information */
3239 var_hist->hist_data = hist_data;
3240
3241 /* Create the new histogram with our variable */
3242 ret = event_hist_trigger_func(&trigger_hist_cmd, file,
3243 "", "hist", cmd);
3244 if (ret) {
3245 kfree(cmd);
3246 kfree(var_hist->cmd);
3247 kfree(var_hist);
7d18a10c 3248 hist_err_event("trace action: Couldn't create histogram for field: ",
f404da6e 3249 subsys_name, event_name, field_name);
02205a67
TZ		 3250 return ERR_PTR(ret);
3251 }
3252
3253 kfree(cmd);
3254
3255 /* If we can't find the variable, something went wrong */
3256 event_var = find_synthetic_field_var(target_hist_data, subsys_name,
3257 event_name, field_name);
3258 if (IS_ERR_OR_NULL(event_var)) {
3259 kfree(var_hist->cmd);
3260 kfree(var_hist);
7d18a10c 3261 hist_err_event("trace action: Couldn't find synthetic variable: ",
f404da6e 3262 subsys_name, event_name, field_name);
02205a67
TZ		 3263 return ERR_PTR(-EINVAL);
3264 }
3265
3266 n = target_hist_data->n_field_var_hists;
3267 target_hist_data->field_var_hists[n] = var_hist;
3268 target_hist_data->n_field_var_hists++;
3269
3270 return event_var;
3271}
3272
c282a386 3273static struct hist_field *
02205a67
TZ		 3274find_target_event_var(struct hist_trigger_data *hist_data,
3275 char *subsys_name, char *event_name, char *var_name)
3276{
3277 struct trace_event_file *file = hist_data->event_file;
3278 struct hist_field *hist_field = NULL;
3279
3280 if (subsys_name) {
3281 struct trace_event_call *call;
3282
3283 if (!event_name)
3284 return NULL;
3285
3286 call = file->event_call;
3287
3288 if (strcmp(subsys_name, call->class->system) != 0)
3289 return NULL;
3290
3291 if (strcmp(event_name, trace_event_name(call)) != 0)
3292 return NULL;
3293 }
3294
3295 hist_field = find_var_field(hist_data, var_name);
3296
3297 return hist_field;
3298}
3299
3300static inline void __update_field_vars(struct tracing_map_elt *elt,
3301 struct ring_buffer_event *rbe,
3302 void *rec,
3303 struct field_var **field_vars,
3304 unsigned int n_field_vars,
3305 unsigned int field_var_str_start)
3306{
3307 struct hist_elt_data *elt_data = elt->private_data;
3308 unsigned int i, j, var_idx;
3309 u64 var_val;
3310
3311 for (i = 0, j = field_var_str_start; i < n_field_vars; i++) {
3312 struct field_var *field_var = field_vars[i];
3313 struct hist_field *var = field_var->var;
3314 struct hist_field *val = field_var->val;
3315
3316 var_val = val->fn(val, elt, rbe, rec);
3317 var_idx = var->var.idx;
3318
3319 if (val->flags & HIST_FIELD_FL_STRING) {
3320 char *str = elt_data->field_var_str[j++];
3321 char *val_str = (char *)(uintptr_t)var_val;
3322
ad452870 3323 strscpy(str, val_str, STR_VAR_LEN_MAX);
02205a67
TZ		 3324 var_val = (u64)(uintptr_t)str;
3325 }
3326 tracing_map_set_var(elt, var_idx, var_val);
3327 }
3328}
3329
3330static void update_field_vars(struct hist_trigger_data *hist_data,
3331 struct tracing_map_elt *elt,
3332 struct ring_buffer_event *rbe,
3333 void *rec)
3334{
3335 __update_field_vars(elt, rbe, rec, hist_data->field_vars,
3336 hist_data->n_field_vars, 0);
3337}
3338
466f4528
TZ		 3339static void save_track_data_vars(struct hist_trigger_data *hist_data,
3340 struct tracing_map_elt *elt, void *rec,
3341 struct ring_buffer_event *rbe, void *key,
3342 struct action_data *data, u64 *var_ref_vals)
50450603 3343{
7d18a10c
TZ		 3344 __update_field_vars(elt, rbe, rec, hist_data->save_vars,
3345 hist_data->n_save_vars, hist_data->n_field_var_str);
50450603
TZ		 3346}
3347
02205a67
TZ		 3348static struct hist_field *create_var(struct hist_trigger_data *hist_data,
3349 struct trace_event_file *file,
3350 char *name, int size, const char *type)
3351{
3352 struct hist_field *var;
3353 int idx;
3354
3355 if (find_var(hist_data, file, name) && !hist_data->remove) {
3356 var = ERR_PTR(-EINVAL);
3357 goto out;
3358 }
3359
3360 var = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
3361 if (!var) {
3362 var = ERR_PTR(-ENOMEM);
3363 goto out;
3364 }
3365
3366 idx = tracing_map_add_var(hist_data->map);
3367 if (idx < 0) {
3368 kfree(var);
3369 var = ERR_PTR(-EINVAL);
3370 goto out;
3371 }
3372
3373 var->flags = HIST_FIELD_FL_VAR;
3374 var->var.idx = idx;
3375 var->var.hist_data = var->hist_data = hist_data;
3376 var->size = size;
3377 var->var.name = kstrdup(name, GFP_KERNEL);
3378 var->type = kstrdup(type, GFP_KERNEL);
3379 if (!var->var.name || !var->type) {
3380 kfree(var->var.name);
3381 kfree(var->type);
3382 kfree(var);
3383 var = ERR_PTR(-ENOMEM);
3384 }
3385 out:
3386 return var;
3387}
3388
3389static struct field_var *create_field_var(struct hist_trigger_data *hist_data,
3390 struct trace_event_file *file,
3391 char *field_name)
3392{
3393 struct hist_field *val = NULL, *var = NULL;
3394 unsigned long flags = HIST_FIELD_FL_VAR;
3395 struct field_var *field_var;
3396 int ret = 0;
3397
3398 if (hist_data->n_field_vars >= SYNTH_FIELDS_MAX) {
f404da6e 3399 hist_err("Too many field variables defined: ", field_name);
02205a67
TZ		 3400 ret = -EINVAL;
3401 goto err;
3402 }
3403
3404 val = parse_atom(hist_data, file, field_name, &flags, NULL);
3405 if (IS_ERR(val)) {
f404da6e 3406 hist_err("Couldn't parse field variable: ", field_name);
02205a67
TZ		 3407 ret = PTR_ERR(val);
3408 goto err;
3409 }
3410
3411 var = create_var(hist_data, file, field_name, val->size, val->type);
3412 if (IS_ERR(var)) {
f404da6e 3413 hist_err("Couldn't create or find variable: ", field_name);
02205a67
TZ		 3414 kfree(val);
3415 ret = PTR_ERR(var);
3416 goto err;
3417 }
3418
3419 field_var = kzalloc(sizeof(struct field_var), GFP_KERNEL);
3420 if (!field_var) {
3421 kfree(val);
3422 kfree(var);
3423 ret = -ENOMEM;
3424 goto err;
3425 }
3426
3427 field_var->var = var;
3428 field_var->val = val;
3429 out:
3430 return field_var;
3431 err:
3432 field_var = ERR_PTR(ret);
3433 goto out;
3434}
3435
3436/**
3437 * create_target_field_var - Automatically create a variable for a field
3438 * @target_hist_data: The target hist trigger
3439 * @subsys_name: Optional subsystem name
3440 * @event_name: Optional event name
3441 * @var_name: The name of the field (and the resulting variable)
3442 *
3443 * Hist trigger actions fetch data from variables, not directly from
3444 * events. However, for convenience, users are allowed to directly
3445 * specify an event field in an action, which will be automatically
3446 * converted into a variable on their behalf.
3447
3448 * This function creates a field variable with the name var_name on
3449 * the hist trigger currently being defined on the target event. If
3450 * subsys_name and event_name are specified, this function simply
3451 * verifies that they do in fact match the target event subsystem and
3452 * event name.
3453 *
3454 * Return: The variable created for the field.
3455 */
c282a386 3456static struct field_var *
02205a67
TZ		 3457create_target_field_var(struct hist_trigger_data *target_hist_data,
3458 char *subsys_name, char *event_name, char *var_name)
3459{
3460 struct trace_event_file *file = target_hist_data->event_file;
3461
3462 if (subsys_name) {
3463 struct trace_event_call *call;
3464
3465 if (!event_name)
3466 return NULL;
3467
3468 call = file->event_call;
3469
3470 if (strcmp(subsys_name, call->class->system) != 0)
3471 return NULL;
3472
3473 if (strcmp(event_name, trace_event_name(call)) != 0)
3474 return NULL;
3475 }
3476
3477 return create_field_var(target_hist_data, file, var_name);
3478}
3479
466f4528
TZ		 3480static bool check_track_val_max(u64 track_val, u64 var_val)
3481{
3482 if (var_val <= track_val)
3483 return false;
3484
3485 return true;
3486}
3487
dff81f55
TZ		 3488static bool check_track_val_changed(u64 track_val, u64 var_val)
3489{
3490 if (var_val == track_val)
3491 return false;
3492
3493 return true;
3494}
3495
466f4528
TZ		 3496static u64 get_track_val(struct hist_trigger_data *hist_data,
3497 struct tracing_map_elt *elt,
3498 struct action_data *data)
50450603 3499{
466f4528
TZ		 3500 unsigned int track_var_idx = data->track_data.track_var->var.idx;
3501 u64 track_val;
3502
3503 track_val = tracing_map_read_var(elt, track_var_idx);
50450603 3504
466f4528
TZ		 3505 return track_val;
3506}
3507
3508static void save_track_val(struct hist_trigger_data *hist_data,
3509 struct tracing_map_elt *elt,
3510 struct action_data *data, u64 var_val)
3511{
3512 unsigned int track_var_idx = data->track_data.track_var->var.idx;
3513
3514 tracing_map_set_var(elt, track_var_idx, var_val);
3515}
3516
3517static void save_track_data(struct hist_trigger_data *hist_data,
3518 struct tracing_map_elt *elt, void *rec,
3519 struct ring_buffer_event *rbe, void *key,
3520 struct action_data *data, u64 *var_ref_vals)
3521{
3522 if (data->track_data.save_data)
3523 data->track_data.save_data(hist_data, elt, rec, rbe, key, data, var_ref_vals);
3524}
3525
3526static bool check_track_val(struct tracing_map_elt *elt,
3527 struct action_data *data,
3528 u64 var_val)
3529{
3530 struct hist_trigger_data *hist_data;
3531 u64 track_val;
3532
3533 hist_data = data->track_data.track_var->hist_data;
3534 track_val = get_track_val(hist_data, elt, data);
3535
3536 return data->track_data.check_val(track_val, var_val);
3537}
3538
a3785b7e
TZ		 3539#ifdef CONFIG_TRACER_SNAPSHOT
3540static bool cond_snapshot_update(struct trace_array *tr, void *cond_data)
3541{
3542 /* called with tr->max_lock held */
3543 struct track_data *track_data = tr->cond_snapshot->cond_data;
3544 struct hist_elt_data *elt_data, *track_elt_data;
3545 struct snapshot_context *context = cond_data;
3546 u64 track_val;
3547
3548 if (!track_data)
3549 return false;
3550
3551 track_val = get_track_val(track_data->hist_data, context->elt,
3552 track_data->action_data);
3553
3554 track_data->track_val = track_val;
3555 memcpy(track_data->key, context->key, track_data->key_len);
3556
3557 elt_data = context->elt->private_data;
3558 track_elt_data = track_data->elt.private_data;
3559 if (elt_data->comm)
27242c62 3560 strncpy(track_elt_data->comm, elt_data->comm, TASK_COMM_LEN);
a3785b7e
TZ		 3561
3562 track_data->updated = true;
3563
3564 return true;
3565}
3566
3567static void save_track_data_snapshot(struct hist_trigger_data *hist_data,
3568 struct tracing_map_elt *elt, void *rec,
3569 struct ring_buffer_event *rbe, void *key,
3570 struct action_data *data,
3571 u64 *var_ref_vals)
3572{
3573 struct trace_event_file *file = hist_data->event_file;
3574 struct snapshot_context context;
3575
3576 context.elt = elt;
3577 context.key = key;
3578
3579 tracing_snapshot_cond(file->tr, &context);
3580}
3581
3582static void hist_trigger_print_key(struct seq_file *m,
3583 struct hist_trigger_data *hist_data,
3584 void *key,
3585 struct tracing_map_elt *elt);
3586
3587static struct action_data *snapshot_action(struct hist_trigger_data *hist_data)
3588{
3589 unsigned int i;
3590
3591 if (!hist_data->n_actions)
3592 return NULL;
3593
3594 for (i = 0; i < hist_data->n_actions; i++) {
3595 struct action_data *data = hist_data->actions[i];
3596
3597 if (data->action == ACTION_SNAPSHOT)
3598 return data;
3599 }
3600
3601 return NULL;
3602}
3603
3604static void track_data_snapshot_print(struct seq_file *m,
3605 struct hist_trigger_data *hist_data)
3606{
3607 struct trace_event_file *file = hist_data->event_file;
3608 struct track_data *track_data;
3609 struct action_data *action;
3610
3611 track_data = tracing_cond_snapshot_data(file->tr);
3612 if (!track_data)
3613 return;
3614
3615 if (!track_data->updated)
3616 return;
3617
3618 action = snapshot_action(hist_data);
3619 if (!action)
3620 return;
3621
3622 seq_puts(m, "\nSnapshot taken (see tracing/snapshot). Details:\n");
3623 seq_printf(m, "\ttriggering value { %s(%s) }: %10llu",
3624 action->handler == HANDLER_ONMAX ? "onmax" : "onchange",
3625 action->track_data.var_str, track_data->track_val);
3626
3627 seq_puts(m, "\ttriggered by event with key: ");
3628 hist_trigger_print_key(m, hist_data, track_data->key, &track_data->elt);
3629 seq_putc(m, '\n');
3630}
3631#else
3632static bool cond_snapshot_update(struct trace_array *tr, void *cond_data)
3633{
3634 return false;
3635}
3636static void save_track_data_snapshot(struct hist_trigger_data *hist_data,
3637 struct tracing_map_elt *elt, void *rec,
3638 struct ring_buffer_event *rbe, void *key,
3639 struct action_data *data,
3640 u64 *var_ref_vals) {}
3641static void track_data_snapshot_print(struct seq_file *m,
3642 struct hist_trigger_data *hist_data) {}
3643#endif /* CONFIG_TRACER_SNAPSHOT */
3644
466f4528
TZ		 3645static void track_data_print(struct seq_file *m,
3646 struct hist_trigger_data *hist_data,
3647 struct tracing_map_elt *elt,
3648 struct action_data *data)
3649{
3650 u64 track_val = get_track_val(hist_data, elt, data);
3651 unsigned int i, save_var_idx;
3652
3653 if (data->handler == HANDLER_ONMAX)
3654 seq_printf(m, "\n\tmax: %10llu", track_val);
dff81f55
TZ		 3655 else if (data->handler == HANDLER_ONCHANGE)
3656 seq_printf(m, "\n\tchanged: %10llu", track_val);
50450603 3657
a3785b7e
TZ		 3658 if (data->action == ACTION_SNAPSHOT)
3659 return;
3660
7d18a10c
TZ		 3661 for (i = 0; i < hist_data->n_save_vars; i++) {
3662 struct hist_field *save_val = hist_data->save_vars[i]->val;
3663 struct hist_field *save_var = hist_data->save_vars[i]->var;
50450603
TZ		 3664 u64 val;
3665
3666 save_var_idx = save_var->var.idx;
3667
3668 val = tracing_map_read_var(elt, save_var_idx);
3669
3670 if (save_val->flags & HIST_FIELD_FL_STRING) {
3671 seq_printf(m, " %s: %-32s", save_var->var.name,
3672 (char *)(uintptr_t)(val));
3673 } else
3674 seq_printf(m, " %s: %10llu", save_var->var.name, val);
3675 }
3676}
3677
466f4528
TZ		 3678static void ontrack_action(struct hist_trigger_data *hist_data,
3679 struct tracing_map_elt *elt, void *rec,
3680 struct ring_buffer_event *rbe, void *key,
3681 struct action_data *data, u64 *var_ref_vals)
50450603 3682{
466f4528 3683 u64 var_val = var_ref_vals[data->track_data.var_ref->var_ref_idx];
50450603 3684
466f4528
TZ		 3685 if (check_track_val(elt, data, var_val)) {
3686 save_track_val(hist_data, elt, data, var_val);
3687 save_track_data(hist_data, elt, rec, rbe, key, data, var_ref_vals);
3688 }
50450603
TZ		 3689}
3690
c3e49506 3691static void action_data_destroy(struct action_data *data)
50450603
TZ		 3692{
3693 unsigned int i;
3694
c3e49506 3695 lockdep_assert_held(&event_mutex);
50450603 3696
7d18a10c 3697 kfree(data->action_name);
50450603
TZ		 3698
3699 for (i = 0; i < data->n_params; i++)
3700 kfree(data->params[i]);
3701
c3e49506
TZ		 3702 if (data->synth_event)
3703 data->synth_event->ref--;
3704
e91eefd7
TZ		 3705 kfree(data->synth_event_name);
3706
50450603
TZ		 3707 kfree(data);
3708}
3709
466f4528
TZ		 3710static void track_data_destroy(struct hist_trigger_data *hist_data,
3711 struct action_data *data)
c3e49506 3712{
a3785b7e
TZ		 3713 struct trace_event_file *file = hist_data->event_file;
3714
466f4528 3715 destroy_hist_field(data->track_data.track_var, 0);
c3e49506 3716
a3785b7e
TZ		 3717 if (data->action == ACTION_SNAPSHOT) {
3718 struct track_data *track_data;
3719
3720 track_data = tracing_cond_snapshot_data(file->tr);
3721 if (track_data && track_data->hist_data == hist_data) {
3722 tracing_snapshot_cond_disable(file->tr);
3723 track_data_free(track_data);
3724 }
3725 }
3726
466f4528 3727 kfree(data->track_data.var_str);
c3e49506
TZ		 3728
3729 action_data_destroy(data);
3730}
3731
7d18a10c
TZ		 3732static int action_create(struct hist_trigger_data *hist_data,
3733 struct action_data *data);
3734
466f4528
TZ		 3735static int track_data_create(struct hist_trigger_data *hist_data,
3736 struct action_data *data)
50450603 3737{
466f4528 3738 struct hist_field *var_field, *ref_field, *track_var = NULL;
50450603 3739 struct trace_event_file *file = hist_data->event_file;
466f4528 3740 char *track_data_var_str;
50450603
TZ		 3741 int ret = 0;
3742
466f4528
TZ		 3743 track_data_var_str = data->track_data.var_str;
3744 if (track_data_var_str[0] != '$') {
dff81f55 3745 hist_err("For onmax(x) or onchange(x), x must be a variable: ", track_data_var_str);
50450603 3746 return -EINVAL;
f404da6e 3747 }
466f4528 3748 track_data_var_str++;
50450603 3749
466f4528 3750 var_field = find_target_event_var(hist_data, NULL, NULL, track_data_var_str);
f404da6e 3751 if (!var_field) {
dff81f55 3752 hist_err("Couldn't find onmax or onchange variable: ", track_data_var_str);
50450603 3753 return -EINVAL;
f404da6e 3754 }
50450603 3755
de40f033 3756 ref_field = create_var_ref(hist_data, var_field, NULL, NULL);
50450603
TZ		 3757 if (!ref_field)
3758 return -ENOMEM;
3759
466f4528 3760 data->track_data.var_ref = ref_field;
50450603 3761
466f4528
TZ		 3762 if (data->handler == HANDLER_ONMAX)
3763 track_var = create_var(hist_data, file, "__max", sizeof(u64), "u64");
3764 if (IS_ERR(track_var)) {
3765 hist_err("Couldn't create onmax variable: ", "__max");
3766 ret = PTR_ERR(track_var);
50450603
TZ		 3767 goto out;
3768 }
dff81f55
TZ		 3769
3770 if (data->handler == HANDLER_ONCHANGE)
3771 track_var = create_var(hist_data, file, "__change", sizeof(u64), "u64");
3772 if (IS_ERR(track_var)) {
3773 hist_err("Couldn't create onchange variable: ", "__change");
3774 ret = PTR_ERR(track_var);
3775 goto out;
3776 }
466f4528 3777 data->track_data.track_var = track_var;
50450603 3778
7d18a10c 3779 ret = action_create(hist_data, data);
50450603
TZ		 3780 out:
3781 return ret;
3782}
3783
3784static int parse_action_params(char *params, struct action_data *data)
3785{
3786 char *param, *saved_param;
e91eefd7 3787 bool first_param = true;
50450603
TZ		 3788 int ret = 0;
3789
3790 while (params) {
7d18a10c
TZ		 3791 if (data->n_params >= SYNTH_FIELDS_MAX) {
3792 hist_err("Too many action params", "");
50450603 3793 goto out;
7d18a10c 3794 }
50450603
TZ		 3795
3796 param = strsep(&params, ",");
3797 if (!param) {
7d18a10c 3798 hist_err("No action param found", "");
50450603
TZ		 3799 ret = -EINVAL;
3800 goto out;
3801 }
3802
3803 param = strstrip(param);
3804 if (strlen(param) < 2) {
f404da6e 3805 hist_err("Invalid action param: ", param);
50450603
TZ		 3806 ret = -EINVAL;
3807 goto out;
3808 }
3809
3810 saved_param = kstrdup(param, GFP_KERNEL);
3811 if (!saved_param) {
3812 ret = -ENOMEM;
3813 goto out;
3814 }
3815
e91eefd7
TZ		 3816 if (first_param && data->use_trace_keyword) {
3817 data->synth_event_name = saved_param;
3818 first_param = false;
3819 continue;
3820 }
3821 first_param = false;
3822
50450603
TZ		 3823 data->params[data->n_params++] = saved_param;
3824 }
3825 out:
3826 return ret;
3827}
3828
7d18a10c
TZ		 3829static int action_parse(char *str, struct action_data *data,
3830 enum handler_id handler)
3831{
3832 char *action_name;
3833 int ret = 0;
3834
3835 strsep(&str, ".");
3836 if (!str) {
3837 hist_err("action parsing: No action found", "");
3838 ret = -EINVAL;
3839 goto out;
3840 }
3841
3842 action_name = strsep(&str, "(");
3843 if (!action_name || !str) {
3844 hist_err("action parsing: No action found", "");
3845 ret = -EINVAL;
3846 goto out;
3847 }
3848
3849 if (str_has_prefix(action_name, "save")) {
3850 char *params = strsep(&str, ")");
3851
3852 if (!params) {
3853 hist_err("action parsing: No params found for %s", "save");
3854 ret = -EINVAL;
3855 goto out;
3856 }
3857
3858 ret = parse_action_params(params, data);
3859 if (ret)
3860 goto out;
3861
3862 if (handler == HANDLER_ONMAX)
466f4528 3863 data->track_data.check_val = check_track_val_max;
dff81f55
TZ		 3864 else if (handler == HANDLER_ONCHANGE)
3865 data->track_data.check_val = check_track_val_changed;
466f4528
TZ		 3866 else {
3867 hist_err("action parsing: Handler doesn't support action: ", action_name);
3868 ret = -EINVAL;
3869 goto out;
3870 }
7d18a10c 3871
466f4528
TZ		 3872 data->track_data.save_data = save_track_data_vars;
3873 data->fn = ontrack_action;
7d18a10c 3874 data->action = ACTION_SAVE;
a3785b7e
TZ		 3875 } else if (str_has_prefix(action_name, "snapshot")) {
3876 char *params = strsep(&str, ")");
3877
3878 if (!str) {
3879 hist_err("action parsing: No closing paren found: %s", params);
3880 ret = -EINVAL;
3881 goto out;
3882 }
3883
3884 if (handler == HANDLER_ONMAX)
3885 data->track_data.check_val = check_track_val_max;
dff81f55
TZ		 3886 else if (handler == HANDLER_ONCHANGE)
3887 data->track_data.check_val = check_track_val_changed;
a3785b7e
TZ		 3888 else {
3889 hist_err("action parsing: Handler doesn't support action: ", action_name);
3890 ret = -EINVAL;
3891 goto out;
3892 }
3893
3894 data->track_data.save_data = save_track_data_snapshot;
3895 data->fn = ontrack_action;
3896 data->action = ACTION_SNAPSHOT;
7d18a10c
TZ		 3897 } else {
3898 char *params = strsep(&str, ")");
3899
e91eefd7
TZ		 3900 if (str_has_prefix(action_name, "trace"))
3901 data->use_trace_keyword = true;
3902
7d18a10c
TZ		 3903 if (params) {
3904 ret = parse_action_params(params, data);
3905 if (ret)
3906 goto out;
3907 }
3908
466f4528
TZ		 3909 if (handler == HANDLER_ONMAX)
3910 data->track_data.check_val = check_track_val_max;
dff81f55
TZ		 3911 else if (handler == HANDLER_ONCHANGE)
3912 data->track_data.check_val = check_track_val_changed;
466f4528
TZ		 3913
3914 if (handler != HANDLER_ONMATCH) {
3915 data->track_data.save_data = action_trace;
3916 data->fn = ontrack_action;
3917 } else
3918 data->fn = action_trace;
3919
7d18a10c
TZ		 3920 data->action = ACTION_TRACE;
3921 }
3922
3923 data->action_name = kstrdup(action_name, GFP_KERNEL);
3924 if (!data->action_name) {
3925 ret = -ENOMEM;
3926 goto out;
3927 }
3928
3929 data->handler = handler;
3930 out:
3931 return ret;
3932}
3933
466f4528
TZ		 3934static struct action_data *track_data_parse(struct hist_trigger_data *hist_data,
3935 char *str, enum handler_id handler)
50450603 3936{
50450603
TZ		 3937 struct action_data *data;
3938 int ret = -EINVAL;
466f4528 3939 char *var_str;
50450603
TZ		 3940
3941 data = kzalloc(sizeof(*data), GFP_KERNEL);
3942 if (!data)
3943 return ERR_PTR(-ENOMEM);
3944
466f4528
TZ		 3945 var_str = strsep(&str, ")");
3946 if (!var_str || !str) {
50450603
TZ		 3947 ret = -EINVAL;
3948 goto free;
3949 }
3950
466f4528
TZ		 3951 data->track_data.var_str = kstrdup(var_str, GFP_KERNEL);
3952 if (!data->track_data.var_str) {
50450603
TZ		 3953 ret = -ENOMEM;
3954 goto free;
3955 }
3956
7d18a10c
TZ		 3957 ret = action_parse(str, data, handler);
3958 if (ret)
50450603 3959 goto free;
50450603
TZ		 3960 out:
3961 return data;
3962 free:
466f4528 3963 track_data_destroy(hist_data, data);
50450603
TZ		 3964 data = ERR_PTR(ret);
3965 goto out;
3966}
3967
c282a386
TZ		 3968static void onmatch_destroy(struct action_data *data)
3969{
c3e49506
TZ		 3970 kfree(data->match_data.event);
3971 kfree(data->match_data.event_system);
c282a386 3972
c3e49506 3973 action_data_destroy(data);
c282a386
TZ		 3974}
3975
02205a67
TZ		 3976static void destroy_field_var(struct field_var *field_var)
3977{
3978 if (!field_var)
3979 return;
3980
3981 destroy_hist_field(field_var->var, 0);
3982 destroy_hist_field(field_var->val, 0);
3983
3984 kfree(field_var);
3985}
3986
3987static void destroy_field_vars(struct hist_trigger_data *hist_data)
3988{
3989 unsigned int i;
3990
3991 for (i = 0; i < hist_data->n_field_vars; i++)
3992 destroy_field_var(hist_data->field_vars[i]);
3993}
3994
c282a386
TZ		 3995static void save_field_var(struct hist_trigger_data *hist_data,
3996 struct field_var *field_var)
02205a67
TZ		 3997{
3998 hist_data->field_vars[hist_data->n_field_vars++] = field_var;
3999
4000 if (field_var->val->flags & HIST_FIELD_FL_STRING)
4001 hist_data->n_field_var_str++;
4002}
4003
c282a386 4004
c282a386
TZ		 4005static int check_synth_field(struct synth_event *event,
4006 struct hist_field *hist_field,
4007 unsigned int field_pos)
4008{
4009 struct synth_field *field;
4010
4011 if (field_pos >= event->n_fields)
4012 return -EINVAL;
4013
4014 field = event->fields[field_pos];
4015
4016 if (strcmp(field->type, hist_field->type) != 0)
4017 return -EINVAL;
4018
4019 return 0;
4020}
4021
c282a386 4022static struct hist_field *
7d18a10c
TZ		 4023trace_action_find_var(struct hist_trigger_data *hist_data,
4024 struct action_data *data,
4025 char *system, char *event, char *var)
c282a386
TZ		 4026{
4027 struct hist_field *hist_field;
4028
4029 var++; /* skip '$' */
4030
4031 hist_field = find_target_event_var(hist_data, system, event, var);
4032 if (!hist_field) {
7d18a10c 4033 if (!system && data->handler == HANDLER_ONMATCH) {
c3e49506
TZ		 4034 system = data->match_data.event_system;
4035 event = data->match_data.event;
c282a386
TZ		 4036 }
4037
4038 hist_field = find_event_var(hist_data, system, event, var);
4039 }
4040
f404da6e 4041 if (!hist_field)
7d18a10c 4042 hist_err_event("trace action: Couldn't find param: $", system, event, var);
f404da6e 4043
c282a386
TZ		 4044 return hist_field;
4045}
4046
4047static struct hist_field *
7d18a10c
TZ		 4048trace_action_create_field_var(struct hist_trigger_data *hist_data,
4049 struct action_data *data, char *system,
4050 char *event, char *var)
c282a386
TZ		 4051{
4052 struct hist_field *hist_field = NULL;
4053 struct field_var *field_var;
4054
4055 /*
4056 * First try to create a field var on the target event (the
4057 * currently being defined). This will create a variable for
4058 * unqualified fields on the target event, or if qualified,
4059 * target fields that have qualified names matching the target.
4060 */
4061 field_var = create_target_field_var(hist_data, system, event, var);
4062
4063 if (field_var && !IS_ERR(field_var)) {
4064 save_field_var(hist_data, field_var);
4065 hist_field = field_var->var;
4066 } else {
4067 field_var = NULL;
4068 /*
4069 * If no explicit system.event is specfied, default to
4070 * looking for fields on the onmatch(system.event.xxx)
4071 * event.
4072 */
7d18a10c 4073 if (!system && data->handler == HANDLER_ONMATCH) {
c3e49506
TZ		 4074 system = data->match_data.event_system;
4075 event = data->match_data.event;
c282a386
TZ		 4076 }
4077
4078 /*
4079 * At this point, we're looking at a field on another
4080 * event. Because we can't modify a hist trigger on
4081 * another event to add a variable for a field, we need
4082 * to create a new trigger on that event and create the
4083 * variable at the same time.
4084 */
4085 hist_field = create_field_var_hist(hist_data, system, event, var);
4086 if (IS_ERR(hist_field))
4087 goto free;
4088 }
4089 out:
4090 return hist_field;
4091 free:
4092 destroy_field_var(field_var);
4093 hist_field = NULL;
4094 goto out;
4095}
4096
7d18a10c
TZ		 4097static int trace_action_create(struct hist_trigger_data *hist_data,
4098 struct action_data *data)
c282a386
TZ		 4099{
4100 char *event_name, *param, *system = NULL;
4101 struct hist_field *hist_field, *var_ref;
4102 unsigned int i, var_ref_idx;
4103 unsigned int field_pos = 0;
4104 struct synth_event *event;
e91eefd7 4105 char *synth_event_name;
c282a386
TZ		 4106 int ret = 0;
4107
0e2b81f7
MH		 4108 lockdep_assert_held(&event_mutex);
4109
e91eefd7
TZ		 4110 if (data->use_trace_keyword)
4111 synth_event_name = data->synth_event_name;
4112 else
4113 synth_event_name = data->action_name;
4114
4115 event = find_synth_event(synth_event_name);
c282a386 4116 if (!event) {
e91eefd7 4117 hist_err("trace action: Couldn't find synthetic event: ", synth_event_name);
c282a386
TZ		 4118 return -EINVAL;
4119 }
7d18a10c 4120
c282a386 4121 event->ref++;
c282a386
TZ		 4122
4123 var_ref_idx = hist_data->n_var_refs;
4124
4125 for (i = 0; i < data->n_params; i++) {
4126 char *p;
4127
4128 p = param = kstrdup(data->params[i], GFP_KERNEL);
4129 if (!param) {
4130 ret = -ENOMEM;
4131 goto err;
4132 }
4133
4134 system = strsep(&param, ".");
4135 if (!param) {
4136 param = (char *)system;
4137 system = event_name = NULL;
4138 } else {
4139 event_name = strsep(&param, ".");
4140 if (!param) {
4141 kfree(p);
4142 ret = -EINVAL;
4143 goto err;
4144 }
4145 }
4146
4147 if (param[0] == '$')
7d18a10c
TZ		 4148 hist_field = trace_action_find_var(hist_data, data,
4149 system, event_name,
4150 param);
c282a386 4151 else
7d18a10c
TZ		 4152 hist_field = trace_action_create_field_var(hist_data,
4153 data,
4154 system,
4155 event_name,
4156 param);
c282a386
TZ		 4157
4158 if (!hist_field) {
4159 kfree(p);
4160 ret = -EINVAL;
4161 goto err;
4162 }
4163
4164 if (check_synth_field(event, hist_field, field_pos) == 0) {
de40f033
TZ		 4165 var_ref = create_var_ref(hist_data, hist_field,
4166 system, event_name);
c282a386
TZ		 4167 if (!var_ref) {
4168 kfree(p);
4169 ret = -ENOMEM;
4170 goto err;
4171 }
4172
c282a386
TZ		 4173 field_pos++;
4174 kfree(p);
4175 continue;
4176 }
4177
7d18a10c 4178 hist_err_event("trace action: Param type doesn't match synthetic event field type: ",
f404da6e 4179 system, event_name, param);
c282a386
TZ		 4180 kfree(p);
4181 ret = -EINVAL;
4182 goto err;
4183 }
4184
4185 if (field_pos != event->n_fields) {
7d18a10c 4186 hist_err("trace action: Param count doesn't match synthetic event field count: ", event->name);
c282a386
TZ		 4187 ret = -EINVAL;
4188 goto err;
4189 }
4190
c3e49506
TZ		 4191 data->synth_event = event;
4192 data->var_ref_idx = var_ref_idx;
c282a386
TZ		 4193 out:
4194 return ret;
4195 err:
c282a386 4196 event->ref--;
c282a386
TZ		 4197
4198 goto out;
4199}
4200
7d18a10c
TZ		 4201static int action_create(struct hist_trigger_data *hist_data,
4202 struct action_data *data)
4203{
a3785b7e
TZ		 4204 struct trace_event_file *file = hist_data->event_file;
4205 struct track_data *track_data;
7d18a10c
TZ		 4206 struct field_var *field_var;
4207 unsigned int i;
4208 char *param;
4209 int ret = 0;
4210
4211 if (data->action == ACTION_TRACE)
4212 return trace_action_create(hist_data, data);
4213
a3785b7e
TZ		 4214 if (data->action == ACTION_SNAPSHOT) {
4215 track_data = track_data_alloc(hist_data->key_size, data, hist_data);
4216 if (IS_ERR(track_data)) {
4217 ret = PTR_ERR(track_data);
4218 goto out;
4219 }
4220
4221 ret = tracing_snapshot_cond_enable(file->tr, track_data,
4222 cond_snapshot_update);
4223 if (ret)
4224 track_data_free(track_data);
4225
4226 goto out;
4227 }
4228
7d18a10c
TZ		 4229 if (data->action == ACTION_SAVE) {
4230 if (hist_data->n_save_vars) {
4231 ret = -EEXIST;
4232 hist_err("save action: Can't have more than one save() action per hist", "");
4233 goto out;
4234 }
4235
4236 for (i = 0; i < data->n_params; i++) {
4237 param = kstrdup(data->params[i], GFP_KERNEL);
4238 if (!param) {
4239 ret = -ENOMEM;
4240 goto out;
4241 }
4242
4243 field_var = create_target_field_var(hist_data, NULL, NULL, param);
4244 if (IS_ERR(field_var)) {
4245 hist_err("save action: Couldn't create field variable: ", param);
4246 ret = PTR_ERR(field_var);
4247 kfree(param);
4248 goto out;
4249 }
4250
4251 hist_data->save_vars[hist_data->n_save_vars++] = field_var;
4252 if (field_var->val->flags & HIST_FIELD_FL_STRING)
4253 hist_data->n_save_var_str++;
4254 kfree(param);
4255 }
4256 }
4257 out:
4258 return ret;
4259}
4260
4261static int onmatch_create(struct hist_trigger_data *hist_data,
4262 struct action_data *data)
4263{
4264 return action_create(hist_data, data);
4265}
4266
c282a386
TZ		 4267static struct action_data *onmatch_parse(struct trace_array *tr, char *str)
4268{
4269 char *match_event, *match_event_system;
c282a386
TZ		 4270 struct action_data *data;
4271 int ret = -EINVAL;
4272
4273 data = kzalloc(sizeof(*data), GFP_KERNEL);
4274 if (!data)
4275 return ERR_PTR(-ENOMEM);
4276
4277 match_event = strsep(&str, ")");
f404da6e
TZ		 4278 if (!match_event || !str) {
4279 hist_err("onmatch: Missing closing paren: ", match_event);
c282a386 4280 goto free;
f404da6e 4281 }
c282a386
TZ		 4282
4283 match_event_system = strsep(&match_event, ".");
f404da6e
TZ		 4284 if (!match_event) {
4285 hist_err("onmatch: Missing subsystem for match event: ", match_event_system);
c282a386 4286 goto free;
f404da6e 4287 }
c282a386 4288
f404da6e
TZ		 4289 if (IS_ERR(event_file(tr, match_event_system, match_event))) {
4290 hist_err_event("onmatch: Invalid subsystem or event name: ",
4291 match_event_system, match_event, NULL);
c282a386 4292 goto free;
f404da6e 4293 }
c282a386 4294
c3e49506
TZ		 4295 data->match_data.event = kstrdup(match_event, GFP_KERNEL);
4296 if (!data->match_data.event) {
c282a386
TZ		 4297 ret = -ENOMEM;
4298 goto free;
4299 }
4300
c3e49506
TZ		 4301 data->match_data.event_system = kstrdup(match_event_system, GFP_KERNEL);
4302 if (!data->match_data.event_system) {
c282a386
TZ		 4303 ret = -ENOMEM;
4304 goto free;
4305 }
4306
7d18a10c 4307 ret = action_parse(str, data, HANDLER_ONMATCH);
c282a386
TZ		 4308 if (ret)
4309 goto free;
4310 out:
4311 return data;
4312 free:
4313 onmatch_destroy(data);
4314 data = ERR_PTR(ret);
4315 goto out;
4316}
4317
7ef224d1
TZ		 4318static int create_hitcount_val(struct hist_trigger_data *hist_data)
4319{
4320 hist_data->fields[HITCOUNT_IDX] =
30350d65 4321 create_hist_field(hist_data, NULL, HIST_FIELD_FL_HITCOUNT, NULL);
7ef224d1
TZ		 4322 if (!hist_data->fields[HITCOUNT_IDX])
4323 return -ENOMEM;
4324
4325 hist_data->n_vals++;
30350d65 4326 hist_data->n_fields++;
7ef224d1
TZ		 4327
4328 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX))
4329 return -EINVAL;
4330
4331 return 0;
4332}
4333
30350d65
TZ		 4334static int __create_val_field(struct hist_trigger_data *hist_data,
4335 unsigned int val_idx,
4336 struct trace_event_file *file,
4337 char *var_name, char *field_str,
4338 unsigned long flags)
f2606835 4339{
100719dc 4340 struct hist_field *hist_field;
f2606835
TZ		 4341 int ret = 0;
4342
100719dc
TZ		 4343 hist_field = parse_expr(hist_data, file, field_str, flags, var_name, 0);
4344 if (IS_ERR(hist_field)) {
4345 ret = PTR_ERR(hist_field);
f2606835
TZ		 4346 goto out;
4347 }
4348
100719dc
TZ		 4349 hist_data->fields[val_idx] = hist_field;
4350
f2606835 4351 ++hist_data->n_vals;
30350d65 4352 ++hist_data->n_fields;
f2606835 4353
30350d65 4354 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
f2606835
TZ		 4355 ret = -EINVAL;
4356 out:
4357 return ret;
4358}
4359
30350d65
TZ		 4360static int create_val_field(struct hist_trigger_data *hist_data,
4361 unsigned int val_idx,
4362 struct trace_event_file *file,
4363 char *field_str)
4364{
4365 if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX))
4366 return -EINVAL;
4367
4368 return __create_val_field(hist_data, val_idx, file, NULL, field_str, 0);
4369}
4370
4371static int create_var_field(struct hist_trigger_data *hist_data,
4372 unsigned int val_idx,
4373 struct trace_event_file *file,
4374 char *var_name, char *expr_str)
4375{
4376 unsigned long flags = 0;
4377
4378 if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
4379 return -EINVAL;
f404da6e 4380
30350d65 4381 if (find_var(hist_data, file, var_name) && !hist_data->remove) {
f404da6e 4382 hist_err("Variable already defined: ", var_name);
30350d65
TZ		 4383 return -EINVAL;
4384 }
4385
4386 flags |= HIST_FIELD_FL_VAR;
4387 hist_data->n_vars++;
4388 if (WARN_ON(hist_data->n_vars > TRACING_MAP_VARS_MAX))
4389 return -EINVAL;
4390
4391 return __create_val_field(hist_data, val_idx, file, var_name, expr_str, flags);
4392}
4393
7ef224d1
TZ		 4394static int create_val_fields(struct hist_trigger_data *hist_data,
4395 struct trace_event_file *file)
4396{
f2606835 4397 char *fields_str, *field_str;
30350d65 4398 unsigned int i, j = 1;
7ef224d1
TZ		 4399 int ret;
4400
4401 ret = create_hitcount_val(hist_data);
f2606835
TZ		 4402 if (ret)
4403 goto out;
7ef224d1 4404
f2606835
TZ		 4405 fields_str = hist_data->attrs->vals_str;
4406 if (!fields_str)
4407 goto out;
4408
4409 strsep(&fields_str, "=");
4410 if (!fields_str)
4411 goto out;
4412
4413 for (i = 0, j = 1; i < TRACING_MAP_VALS_MAX &&
4414 j < TRACING_MAP_VALS_MAX; i++) {
4415 field_str = strsep(&fields_str, ",");
4416 if (!field_str)
4417 break;
30350d65 4418
f2606835
TZ		 4419 if (strcmp(field_str, "hitcount") == 0)
4420 continue;
30350d65 4421
f2606835
TZ		 4422 ret = create_val_field(hist_data, j++, file, field_str);
4423 if (ret)
4424 goto out;
4425 }
30350d65 4426
f2606835
TZ		 4427 if (fields_str && (strcmp(fields_str, "hitcount") != 0))
4428 ret = -EINVAL;
4429 out:
7ef224d1
TZ		 4430 return ret;
4431}
4432
4433static int create_key_field(struct hist_trigger_data *hist_data,
4434 unsigned int key_idx,
76a3b0c8 4435 unsigned int key_offset,
7ef224d1
TZ		 4436 struct trace_event_file *file,
4437 char *field_str)
4438{
30350d65 4439 struct hist_field *hist_field = NULL;
100719dc 4440
7ef224d1
TZ		 4441 unsigned long flags = 0;
4442 unsigned int key_size;
4443 int ret = 0;
4444
30350d65 4445 if (WARN_ON(key_idx >= HIST_FIELDS_MAX))
7ef224d1
TZ		 4446 return -EINVAL;
4447
4448 flags |= HIST_FIELD_FL_KEY;
4449
69a0200c
TZ		 4450 if (strcmp(field_str, "stacktrace") == 0) {
4451 flags |= HIST_FIELD_FL_STACKTRACE;
4452 key_size = sizeof(unsigned long) * HIST_STACKTRACE_DEPTH;
30350d65 4453 hist_field = create_hist_field(hist_data, NULL, flags, NULL);
69a0200c 4454 } else {
100719dc
TZ		 4455 hist_field = parse_expr(hist_data, file, field_str, flags,
4456 NULL, 0);
4457 if (IS_ERR(hist_field)) {
4458 ret = PTR_ERR(hist_field);
4459 goto out;
69a0200c
TZ		 4460 }
4461
067fe038 4462 if (hist_field->flags & HIST_FIELD_FL_VAR_REF) {
f404da6e 4463 hist_err("Using variable references as keys not supported: ", field_str);
067fe038
TZ		 4464 destroy_hist_field(hist_field, 0);
4465 ret = -EINVAL;
4466 goto out;
4467 }
4468
100719dc 4469 key_size = hist_field->size;
7ef224d1
TZ		 4470 }
4471
100719dc 4472 hist_data->fields[key_idx] = hist_field;
7ef224d1
TZ		 4473
4474 key_size = ALIGN(key_size, sizeof(u64));
4475 hist_data->fields[key_idx]->size = key_size;
76a3b0c8 4476 hist_data->fields[key_idx]->offset = key_offset;
100719dc 4477
76a3b0c8 4478 hist_data->key_size += key_size;
100719dc 4479
7ef224d1
TZ		 4480 if (hist_data->key_size > HIST_KEY_SIZE_MAX) {
4481 ret = -EINVAL;
4482 goto out;
4483 }
4484
4485 hist_data->n_keys++;
30350d65 4486 hist_data->n_fields++;
7ef224d1
TZ		 4487
4488 if (WARN_ON(hist_data->n_keys > TRACING_MAP_KEYS_MAX))
4489 return -EINVAL;
4490
4491 ret = key_size;
4492 out:
4493 return ret;
4494}
4495
4496static int create_key_fields(struct hist_trigger_data *hist_data,
4497 struct trace_event_file *file)
4498{
76a3b0c8 4499 unsigned int i, key_offset = 0, n_vals = hist_data->n_vals;
7ef224d1
TZ		 4500 char *fields_str, *field_str;
4501 int ret = -EINVAL;
4502
4503 fields_str = hist_data->attrs->keys_str;
4504 if (!fields_str)
4505 goto out;
4506
4507 strsep(&fields_str, "=");
4508 if (!fields_str)
4509 goto out;
4510
76a3b0c8 4511 for (i = n_vals; i < n_vals + TRACING_MAP_KEYS_MAX; i++) {
7ef224d1
TZ		 4512 field_str = strsep(&fields_str, ",");
4513 if (!field_str)
4514 break;
76a3b0c8
TZ		 4515 ret = create_key_field(hist_data, i, key_offset,
4516 file, field_str);
7ef224d1
TZ		 4517 if (ret < 0)
4518 goto out;
76a3b0c8 4519 key_offset += ret;
7ef224d1
TZ		 4520 }
4521 if (fields_str) {
4522 ret = -EINVAL;
4523 goto out;
4524 }
4525 ret = 0;
4526 out:
4527 return ret;
4528}
4529
30350d65
TZ		 4530static int create_var_fields(struct hist_trigger_data *hist_data,
4531 struct trace_event_file *file)
4532{
4533 unsigned int i, j = hist_data->n_vals;
4534 int ret = 0;
4535
4536 unsigned int n_vars = hist_data->attrs->var_defs.n_vars;
4537
4538 for (i = 0; i < n_vars; i++) {
4539 char *var_name = hist_data->attrs->var_defs.name[i];
4540 char *expr = hist_data->attrs->var_defs.expr[i];
4541
4542 ret = create_var_field(hist_data, j++, file, var_name, expr);
4543 if (ret)
4544 goto out;
4545 }
4546 out:
4547 return ret;
4548}
4549
4550static void free_var_defs(struct hist_trigger_data *hist_data)
4551{
4552 unsigned int i;
4553
4554 for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) {
4555 kfree(hist_data->attrs->var_defs.name[i]);
4556 kfree(hist_data->attrs->var_defs.expr[i]);
4557 }
4558
4559 hist_data->attrs->var_defs.n_vars = 0;
4560}
4561
4562static int parse_var_defs(struct hist_trigger_data *hist_data)
4563{
4564 char *s, *str, *var_name, *field_str;
4565 unsigned int i, j, n_vars = 0;
4566 int ret = 0;
4567
4568 for (i = 0; i < hist_data->attrs->n_assignments; i++) {
4569 str = hist_data->attrs->assignment_str[i];
4570 for (j = 0; j < TRACING_MAP_VARS_MAX; j++) {
4571 field_str = strsep(&str, ",");
4572 if (!field_str)
4573 break;
4574
4575 var_name = strsep(&field_str, "=");
4576 if (!var_name || !field_str) {
f404da6e 4577 hist_err("Malformed assignment: ", var_name);
30350d65
TZ		 4578 ret = -EINVAL;
4579 goto free;
4580 }
4581
4582 if (n_vars == TRACING_MAP_VARS_MAX) {
f404da6e 4583 hist_err("Too many variables defined: ", var_name);
30350d65
TZ		 4584 ret = -EINVAL;
4585 goto free;
4586 }
4587
4588 s = kstrdup(var_name, GFP_KERNEL);
4589 if (!s) {
4590 ret = -ENOMEM;
4591 goto free;
4592 }
4593 hist_data->attrs->var_defs.name[n_vars] = s;
4594
4595 s = kstrdup(field_str, GFP_KERNEL);
4596 if (!s) {
4597 kfree(hist_data->attrs->var_defs.name[n_vars]);
4598 ret = -ENOMEM;
4599 goto free;
4600 }
4601 hist_data->attrs->var_defs.expr[n_vars++] = s;
4602
4603 hist_data->attrs->var_defs.n_vars = n_vars;
4604 }
4605 }
4606
4607 return ret;
4608 free:
4609 free_var_defs(hist_data);
4610
4611 return ret;
4612}
4613
7ef224d1
TZ		 4614static int create_hist_fields(struct hist_trigger_data *hist_data,
4615 struct trace_event_file *file)
4616{
4617 int ret;
4618
30350d65
TZ		 4619 ret = parse_var_defs(hist_data);
4620 if (ret)
4621 goto out;
4622
7ef224d1
TZ		 4623 ret = create_val_fields(hist_data, file);
4624 if (ret)
4625 goto out;
4626
30350d65 4627 ret = create_var_fields(hist_data, file);
7ef224d1
TZ		 4628 if (ret)
4629 goto out;
4630
30350d65
TZ		 4631 ret = create_key_fields(hist_data, file);
4632 if (ret)
4633 goto out;
7ef224d1 4634 out:
30350d65
TZ		 4635 free_var_defs(hist_data);
4636
7ef224d1
TZ		 4637 return ret;
4638}
4639
e62347d2
TZ		 4640static int is_descending(const char *str)
4641{
4642 if (!str)
4643 return 0;
4644
4645 if (strcmp(str, "descending") == 0)
4646 return 1;
4647
4648 if (strcmp(str, "ascending") == 0)
4649 return 0;
4650
4651 return -EINVAL;
4652}
4653
7ef224d1
TZ		 4654static int create_sort_keys(struct hist_trigger_data *hist_data)
4655{
e62347d2 4656 char *fields_str = hist_data->attrs->sort_key_str;
e62347d2
TZ		 4657 struct tracing_map_sort_key *sort_key;
4658 int descending, ret = 0;
30350d65 4659 unsigned int i, j, k;
e62347d2
TZ		 4660
4661 hist_data->n_sort_keys = 1; /* we always have at least one, hitcount */
4662
4663 if (!fields_str)
4664 goto out;
4665
4666 strsep(&fields_str, "=");
4667 if (!fields_str) {
4668 ret = -EINVAL;
4669 goto out;
4670 }
4671
4672 for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) {
85013256 4673 struct hist_field *hist_field;
e62347d2 4674 char *field_str, *field_name;
85013256 4675 const char *test_name;
e62347d2
TZ		 4676
4677 sort_key = &hist_data->sort_keys[i];
4678
4679 field_str = strsep(&fields_str, ",");
4680 if (!field_str) {
4681 if (i == 0)
4682 ret = -EINVAL;
4683 break;
4684 }
4685
4686 if ((i == TRACING_MAP_SORT_KEYS_MAX - 1) && fields_str) {
4687 ret = -EINVAL;
4688 break;
4689 }
7ef224d1 4690
e62347d2
TZ		 4691 field_name = strsep(&field_str, ".");
4692 if (!field_name) {
4693 ret = -EINVAL;
4694 break;
4695 }
4696
4697 if (strcmp(field_name, "hitcount") == 0) {
4698 descending = is_descending(field_str);
4699 if (descending < 0) {
4700 ret = descending;
4701 break;
4702 }
4703 sort_key->descending = descending;
4704 continue;
4705 }
7ef224d1 4706
30350d65
TZ		 4707 for (j = 1, k = 1; j < hist_data->n_fields; j++) {
4708 unsigned int idx;
4709
85013256 4710 hist_field = hist_data->fields[j];
30350d65
TZ		 4711 if (hist_field->flags & HIST_FIELD_FL_VAR)
4712 continue;
4713
4714 idx = k++;
4715
85013256
TZ		 4716 test_name = hist_field_name(hist_field, 0);
4717
4718 if (strcmp(field_name, test_name) == 0) {
30350d65 4719 sort_key->field_idx = idx;
e62347d2
TZ		 4720 descending = is_descending(field_str);
4721 if (descending < 0) {
4722 ret = descending;
4723 goto out;
4724 }
4725 sort_key->descending = descending;
4726 break;
4727 }
4728 }
4729 if (j == hist_data->n_fields) {
4730 ret = -EINVAL;
4731 break;
4732 }
4733 }
30350d65 4734
e62347d2
TZ		 4735 hist_data->n_sort_keys = i;
4736 out:
7ef224d1
TZ		 4737 return ret;
4738}
4739
0212e2aa
TZ		 4740static void destroy_actions(struct hist_trigger_data *hist_data)
4741{
4742 unsigned int i;
4743
4744 for (i = 0; i < hist_data->n_actions; i++) {
4745 struct action_data *data = hist_data->actions[i];
4746
7d18a10c 4747 if (data->handler == HANDLER_ONMATCH)
c282a386 4748 onmatch_destroy(data);
dff81f55
TZ		 4749 else if (data->handler == HANDLER_ONMAX ||
4750 data->handler == HANDLER_ONCHANGE)
466f4528 4751 track_data_destroy(hist_data, data);
c282a386
TZ		 4752 else
4753 kfree(data);
0212e2aa
TZ		 4754 }
4755}
4756
4757static int parse_actions(struct hist_trigger_data *hist_data)
4758{
c282a386
TZ		 4759 struct trace_array *tr = hist_data->event_file->tr;
4760 struct action_data *data;
0212e2aa
TZ		 4761 unsigned int i;
4762 int ret = 0;
4763 char *str;
036876fa 4764 int len;
0212e2aa
TZ		 4765
4766 for (i = 0; i < hist_data->attrs->n_actions; i++) {
4767 str = hist_data->attrs->action_str[i];
c282a386 4768
036876fa
SRV		 4769 if ((len = str_has_prefix(str, "onmatch("))) {
4770 char *action_str = str + len;
c282a386
TZ		 4771
4772 data = onmatch_parse(tr, action_str);
4773 if (IS_ERR(data)) {
4774 ret = PTR_ERR(data);
4775 break;
4776 }
036876fa
SRV		 4777 } else if ((len = str_has_prefix(str, "onmax("))) {
4778 char *action_str = str + len;
50450603 4779
466f4528
TZ		 4780 data = track_data_parse(hist_data, action_str,
4781 HANDLER_ONMAX);
50450603
TZ		 4782 if (IS_ERR(data)) {
4783 ret = PTR_ERR(data);
4784 break;
4785 }
dff81f55
TZ		 4786 } else if ((len = str_has_prefix(str, "onchange("))) {
4787 char *action_str = str + len;
4788
4789 data = track_data_parse(hist_data, action_str,
4790 HANDLER_ONCHANGE);
4791 if (IS_ERR(data)) {
4792 ret = PTR_ERR(data);
4793 break;
4794 }
c282a386
TZ		 4795 } else {
4796 ret = -EINVAL;
4797 break;
4798 }
4799
4800 hist_data->actions[hist_data->n_actions++] = data;
0212e2aa
TZ		 4801 }
4802
4803 return ret;
4804}
4805
7d18a10c 4806static int create_actions(struct hist_trigger_data *hist_data)
0212e2aa
TZ		 4807{
4808 struct action_data *data;
4809 unsigned int i;
4810 int ret = 0;
4811
4812 for (i = 0; i < hist_data->attrs->n_actions; i++) {
4813 data = hist_data->actions[i];
c282a386 4814
7d18a10c
TZ		 4815 if (data->handler == HANDLER_ONMATCH) {
4816 ret = onmatch_create(hist_data, data);
c282a386 4817 if (ret)
7d18a10c 4818 break;
dff81f55
TZ		 4819 } else if (data->handler == HANDLER_ONMAX ||
4820 data->handler == HANDLER_ONCHANGE) {
466f4528 4821 ret = track_data_create(hist_data, data);
50450603 4822 if (ret)
7d18a10c
TZ		 4823 break;
4824 } else {
4825 ret = -EINVAL;
4826 break;
c282a386 4827 }
0212e2aa
TZ		 4828 }
4829
4830 return ret;
4831}
4832
50450603
TZ		 4833static void print_actions(struct seq_file *m,
4834 struct hist_trigger_data *hist_data,
4835 struct tracing_map_elt *elt)
4836{
4837 unsigned int i;
4838
4839 for (i = 0; i < hist_data->n_actions; i++) {
4840 struct action_data *data = hist_data->actions[i];
4841
a3785b7e
TZ		 4842 if (data->action == ACTION_SNAPSHOT)
4843 continue;
4844
dff81f55
TZ		 4845 if (data->handler == HANDLER_ONMAX ||
4846 data->handler == HANDLER_ONCHANGE)
466f4528 4847 track_data_print(m, hist_data, elt, data);
50450603
TZ		 4848 }
4849}
4850
7d18a10c
TZ		 4851static void print_action_spec(struct seq_file *m,
4852 struct hist_trigger_data *hist_data,
4853 struct action_data *data)
4854{
4855 unsigned int i;
4856
4857 if (data->action == ACTION_SAVE) {
4858 for (i = 0; i < hist_data->n_save_vars; i++) {
4859 seq_printf(m, "%s", hist_data->save_vars[i]->var->var.name);
4860 if (i < hist_data->n_save_vars - 1)
4861 seq_puts(m, ",");
4862 }
4863 } else if (data->action == ACTION_TRACE) {
e91eefd7
TZ		 4864 if (data->use_trace_keyword)
4865 seq_printf(m, "%s", data->synth_event_name);
7d18a10c 4866 for (i = 0; i < data->n_params; i++) {
e91eefd7 4867 if (i || data->use_trace_keyword)
7d18a10c
TZ		 4868 seq_puts(m, ",");
4869 seq_printf(m, "%s", data->params[i]);
4870 }
4871 }
4872}
4873
466f4528
TZ		 4874static void print_track_data_spec(struct seq_file *m,
4875 struct hist_trigger_data *hist_data,
4876 struct action_data *data)
50450603 4877{
466f4528
TZ		 4878 if (data->handler == HANDLER_ONMAX)
4879 seq_puts(m, ":onmax(");
dff81f55
TZ		 4880 else if (data->handler == HANDLER_ONCHANGE)
4881 seq_puts(m, ":onchange(");
466f4528 4882 seq_printf(m, "%s", data->track_data.var_str);
7d18a10c
TZ		 4883 seq_printf(m, ").%s(", data->action_name);
4884
4885 print_action_spec(m, hist_data, data);
50450603 4886
50450603
TZ		 4887 seq_puts(m, ")");
4888}
4889
c282a386
TZ		 4890static void print_onmatch_spec(struct seq_file *m,
4891 struct hist_trigger_data *hist_data,
4892 struct action_data *data)
4893{
c3e49506
TZ		 4894 seq_printf(m, ":onmatch(%s.%s).", data->match_data.event_system,
4895 data->match_data.event);
c282a386 4896
7d18a10c 4897 seq_printf(m, "%s(", data->action_name);
c282a386 4898
7d18a10c 4899 print_action_spec(m, hist_data, data);
c282a386
TZ		 4900
4901 seq_puts(m, ")");
4902}
4903
48f79473
TZ		 4904static bool actions_match(struct hist_trigger_data *hist_data,
4905 struct hist_trigger_data *hist_data_test)
4906{
4907 unsigned int i, j;
4908
4909 if (hist_data->n_actions != hist_data_test->n_actions)
4910 return false;
4911
4912 for (i = 0; i < hist_data->n_actions; i++) {
4913 struct action_data *data = hist_data->actions[i];
4914 struct action_data *data_test = hist_data_test->actions[i];
e91eefd7 4915 char *action_name, *action_name_test;
48f79473 4916
7d18a10c
TZ		 4917 if (data->handler != data_test->handler)
4918 return false;
4919 if (data->action != data_test->action)
48f79473
TZ		 4920 return false;
4921
4922 if (data->n_params != data_test->n_params)
4923 return false;
4924
4925 for (j = 0; j < data->n_params; j++) {
4926 if (strcmp(data->params[j], data_test->params[j]) != 0)
4927 return false;
4928 }
4929
e91eefd7
TZ		 4930 if (data->use_trace_keyword)
4931 action_name = data->synth_event_name;
4932 else
4933 action_name = data->action_name;
4934
4935 if (data_test->use_trace_keyword)
4936 action_name_test = data_test->synth_event_name;
4937 else
4938 action_name_test = data_test->action_name;
4939
4940 if (strcmp(action_name, action_name_test) != 0)
7d18a10c
TZ		 4941 return false;
4942
4943 if (data->handler == HANDLER_ONMATCH) {
c3e49506
TZ		 4944 if (strcmp(data->match_data.event_system,
4945 data_test->match_data.event_system) != 0)
48f79473 4946 return false;
c3e49506
TZ		 4947 if (strcmp(data->match_data.event,
4948 data_test->match_data.event) != 0)
48f79473 4949 return false;
dff81f55
TZ		 4950 } else if (data->handler == HANDLER_ONMAX ||
4951 data->handler == HANDLER_ONCHANGE) {
466f4528
TZ		 4952 if (strcmp(data->track_data.var_str,
4953 data_test->track_data.var_str) != 0)
48f79473 4954 return false;
48f79473
TZ		 4955 }
4956 }
4957
4958 return true;
4959}
4960
4961
c282a386
TZ		 4962static void print_actions_spec(struct seq_file *m,
4963 struct hist_trigger_data *hist_data)
4964{
4965 unsigned int i;
4966
4967 for (i = 0; i < hist_data->n_actions; i++) {
4968 struct action_data *data = hist_data->actions[i];
4969
7d18a10c 4970 if (data->handler == HANDLER_ONMATCH)
c282a386 4971 print_onmatch_spec(m, hist_data, data);
dff81f55
TZ		 4972 else if (data->handler == HANDLER_ONMAX ||
4973 data->handler == HANDLER_ONCHANGE)
466f4528 4974 print_track_data_spec(m, hist_data, data);
c282a386
TZ		 4975 }
4976}
4977
02205a67
TZ		 4978static void destroy_field_var_hists(struct hist_trigger_data *hist_data)
4979{
4980 unsigned int i;
4981
4982 for (i = 0; i < hist_data->n_field_var_hists; i++) {
4983 kfree(hist_data->field_var_hists[i]->cmd);
4984 kfree(hist_data->field_var_hists[i]);
4985 }
4986}
4987
7ef224d1
TZ		 4988static void destroy_hist_data(struct hist_trigger_data *hist_data)
4989{
0212e2aa
TZ		 4990 if (!hist_data)
4991 return;
4992
7ef224d1
TZ		 4993 destroy_hist_trigger_attrs(hist_data->attrs);
4994 destroy_hist_fields(hist_data);
4995 tracing_map_destroy(hist_data->map);
0212e2aa
TZ		 4996
4997 destroy_actions(hist_data);
02205a67
TZ		 4998 destroy_field_vars(hist_data);
4999 destroy_field_var_hists(hist_data);
0212e2aa 5000
7ef224d1
TZ		 5001 kfree(hist_data);
5002}
5003
5004static int create_tracing_map_fields(struct hist_trigger_data *hist_data)
5005{
5006 struct tracing_map *map = hist_data->map;
5007 struct ftrace_event_field *field;
5008 struct hist_field *hist_field;
b28d7b2d 5009 int i, idx = 0;
7ef224d1
TZ		 5010
5011 for_each_hist_field(i, hist_data) {
5012 hist_field = hist_data->fields[i];
5013 if (hist_field->flags & HIST_FIELD_FL_KEY) {
5014 tracing_map_cmp_fn_t cmp_fn;
5015
5016 field = hist_field->field;
5017
69a0200c
TZ		 5018 if (hist_field->flags & HIST_FIELD_FL_STACKTRACE)
5019 cmp_fn = tracing_map_cmp_none;
ad42febe
TZ		 5020 else if (!field)
5021 cmp_fn = tracing_map_cmp_num(hist_field->size,
5022 hist_field->is_signed);
69a0200c 5023 else if (is_string_field(field))
7ef224d1
TZ		 5024 cmp_fn = tracing_map_cmp_string;
5025 else
5026 cmp_fn = tracing_map_cmp_num(field->size,
5027 field->is_signed);
76a3b0c8
TZ		 5028 idx = tracing_map_add_key_field(map,
5029 hist_field->offset,
5030 cmp_fn);
30350d65 5031 } else if (!(hist_field->flags & HIST_FIELD_FL_VAR))
7ef224d1
TZ		 5032 idx = tracing_map_add_sum_field(map);
5033
5034 if (idx < 0)
5035 return idx;
30350d65
TZ		 5036
5037 if (hist_field->flags & HIST_FIELD_FL_VAR) {
5038 idx = tracing_map_add_var(map);
5039 if (idx < 0)
5040 return idx;
5041 hist_field->var.idx = idx;
5042 hist_field->var.hist_data = hist_data;
5043 }
7ef224d1
TZ		 5044 }
5045
5046 return 0;
5047}
5048
5049static struct hist_trigger_data *
5050create_hist_data(unsigned int map_bits,
5051 struct hist_trigger_attrs *attrs,
30350d65
TZ		 5052 struct trace_event_file *file,
5053 bool remove)
7ef224d1 5054{
6b4827ad 5055 const struct tracing_map_ops *map_ops = NULL;
7ef224d1
TZ		 5056 struct hist_trigger_data *hist_data;
5057 int ret = 0;
5058
5059 hist_data = kzalloc(sizeof(*hist_data), GFP_KERNEL);
5060 if (!hist_data)
5061 return ERR_PTR(-ENOMEM);
5062
5063 hist_data->attrs = attrs;
30350d65 5064 hist_data->remove = remove;
067fe038 5065 hist_data->event_file = file;
7ef224d1 5066
0212e2aa
TZ		 5067 ret = parse_actions(hist_data);
5068 if (ret)
5069 goto free;
5070
7ef224d1
TZ		 5071 ret = create_hist_fields(hist_data, file);
5072 if (ret)
5073 goto free;
5074
5075 ret = create_sort_keys(hist_data);
5076 if (ret)
5077 goto free;
5078
af6a29bc 5079 map_ops = &hist_trigger_elt_data_ops;
6b4827ad 5080
7ef224d1 5081 hist_data->map = tracing_map_create(map_bits, hist_data->key_size,
6b4827ad 5082 map_ops, hist_data);
7ef224d1
TZ		 5083 if (IS_ERR(hist_data->map)) {
5084 ret = PTR_ERR(hist_data->map);
5085 hist_data->map = NULL;
5086 goto free;
5087 }
5088
5089 ret = create_tracing_map_fields(hist_data);
5090 if (ret)
5091 goto free;
7ef224d1
TZ		 5092 out:
5093 return hist_data;
5094 free:
5095 hist_data->attrs = NULL;
5096
5097 destroy_hist_data(hist_data);
5098
5099 hist_data = ERR_PTR(ret);
5100
5101 goto out;
5102}
5103
5104static void hist_trigger_elt_update(struct hist_trigger_data *hist_data,
fbd302cb 5105 struct tracing_map_elt *elt, void *rec,
067fe038
TZ		 5106 struct ring_buffer_event *rbe,
5107 u64 *var_ref_vals)
7ef224d1 5108{
067fe038 5109 struct hist_elt_data *elt_data;
7ef224d1 5110 struct hist_field *hist_field;
30350d65 5111 unsigned int i, var_idx;
7ef224d1
TZ		 5112 u64 hist_val;
5113
067fe038
TZ		 5114 elt_data = elt->private_data;
5115 elt_data->var_ref_vals = var_ref_vals;
5116
7ef224d1
TZ		 5117 for_each_hist_val_field(i, hist_data) {
5118 hist_field = hist_data->fields[i];
df35d93b 5119 hist_val = hist_field->fn(hist_field, elt, rbe, rec);
30350d65
TZ		 5120 if (hist_field->flags & HIST_FIELD_FL_VAR) {
5121 var_idx = hist_field->var.idx;
5122 tracing_map_set_var(elt, var_idx, hist_val);
5123 continue;
5124 }
7ef224d1
TZ		 5125 tracing_map_update_sum(elt, i, hist_val);
5126 }
30350d65
TZ		 5127
5128 for_each_hist_key_field(i, hist_data) {
5129 hist_field = hist_data->fields[i];
5130 if (hist_field->flags & HIST_FIELD_FL_VAR) {
df35d93b 5131 hist_val = hist_field->fn(hist_field, elt, rbe, rec);
30350d65
TZ		 5132 var_idx = hist_field->var.idx;
5133 tracing_map_set_var(elt, var_idx, hist_val);
5134 }
5135 }
02205a67
TZ		 5136
5137 update_field_vars(hist_data, elt, rbe, rec);
7ef224d1
TZ		 5138}
5139
6a475cb1
TZ		 5140static inline void add_to_key(char *compound_key, void *key,
5141 struct hist_field *key_field, void *rec)
5142{
5143 size_t size = key_field->size;
5144
5145 if (key_field->flags & HIST_FIELD_FL_STRING) {
5146 struct ftrace_event_field *field;
5147
5148 field = key_field->field;
5149 if (field->filter_type == FILTER_DYN_STRING)
5150 size = *(u32 *)(rec + field->offset) >> 16;
5151 else if (field->filter_type == FILTER_PTR_STRING)
5152 size = strlen(key);
5153 else if (field->filter_type == FILTER_STATIC_STRING)
5154 size = field->size;
5155
5156 /* ensure NULL-termination */
5157 if (size > key_field->size - 1)
5158 size = key_field->size - 1;
6a475cb1 5159
9f0bbf31
TZ		 5160 strncpy(compound_key + key_field->offset, (char *)key, size);
5161 } else
5162 memcpy(compound_key + key_field->offset, key, size);
6a475cb1
TZ		 5163}
5164
0212e2aa
TZ		 5165static void
5166hist_trigger_actions(struct hist_trigger_data *hist_data,
5167 struct tracing_map_elt *elt, void *rec,
7d18a10c
TZ		 5168 struct ring_buffer_event *rbe, void *key,
5169 u64 *var_ref_vals)
0212e2aa
TZ		 5170{
5171 struct action_data *data;
5172 unsigned int i;
5173
5174 for (i = 0; i < hist_data->n_actions; i++) {
5175 data = hist_data->actions[i];
7d18a10c 5176 data->fn(hist_data, elt, rec, rbe, key, data, var_ref_vals);
0212e2aa
TZ		 5177 }
5178}
5179
1ac4f51c 5180static void event_hist_trigger(struct event_trigger_data *data, void *rec,
fbd302cb 5181 struct ring_buffer_event *rbe)
7ef224d1
TZ		 5182{
5183 struct hist_trigger_data *hist_data = data->private_data;
6a475cb1 5184 bool use_compound_key = (hist_data->n_keys > 1);
69a0200c 5185 unsigned long entries[HIST_STACKTRACE_DEPTH];
067fe038 5186 u64 var_ref_vals[TRACING_MAP_VARS_MAX];
76a3b0c8 5187 char compound_key[HIST_KEY_SIZE_MAX];
df35d93b 5188 struct tracing_map_elt *elt = NULL;
69a0200c 5189 struct stack_trace stacktrace;
7ef224d1 5190 struct hist_field *key_field;
7ef224d1
TZ		 5191 u64 field_contents;
5192 void *key = NULL;
5193 unsigned int i;
5194
6a475cb1 5195 memset(compound_key, 0, hist_data->key_size);
76a3b0c8 5196
7ef224d1
TZ		 5197 for_each_hist_key_field(i, hist_data) {
5198 key_field = hist_data->fields[i];
5199
69a0200c
TZ		 5200 if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
5201 stacktrace.max_entries = HIST_STACKTRACE_DEPTH;
5202 stacktrace.entries = entries;
5203 stacktrace.nr_entries = 0;
5204 stacktrace.skip = HIST_STACKTRACE_SKIP;
76a3b0c8 5205
69a0200c
TZ		 5206 memset(stacktrace.entries, 0, HIST_STACKTRACE_SIZE);
5207 save_stack_trace(&stacktrace);
5208
5209 key = entries;
5210 } else {
df35d93b 5211 field_contents = key_field->fn(key_field, elt, rbe, rec);
6a475cb1 5212 if (key_field->flags & HIST_FIELD_FL_STRING) {
69a0200c 5213 key = (void *)(unsigned long)field_contents;
6a475cb1
TZ		 5214 use_compound_key = true;
5215 } else
69a0200c 5216 key = (void *)&field_contents;
76a3b0c8 5217 }
6a475cb1
TZ		 5218
5219 if (use_compound_key)
5220 add_to_key(compound_key, key, key_field, rec);
7ef224d1
TZ		 5221 }
5222
6a475cb1 5223 if (use_compound_key)
76a3b0c8
TZ		 5224 key = compound_key;
5225
067fe038
TZ		 5226 if (hist_data->n_var_refs &&
5227 !resolve_var_refs(hist_data, key, var_ref_vals, false))
5228 return;
5229
7ef224d1 5230 elt = tracing_map_insert(hist_data->map, key);
067fe038
TZ		 5231 if (!elt)
5232 return;
5233
5234 hist_trigger_elt_update(hist_data, elt, rec, rbe, var_ref_vals);
0212e2aa
TZ		 5235
5236 if (resolve_var_refs(hist_data, key, var_ref_vals, true))
7d18a10c 5237 hist_trigger_actions(hist_data, elt, rec, rbe, key, var_ref_vals);
7ef224d1
TZ		 5238}
5239
69a0200c
TZ		 5240static void hist_trigger_stacktrace_print(struct seq_file *m,
5241 unsigned long *stacktrace_entries,
5242 unsigned int max_entries)
5243{
5244 char str[KSYM_SYMBOL_LEN];
5245 unsigned int spaces = 8;
5246 unsigned int i;
5247
5248 for (i = 0; i < max_entries; i++) {
4285f2fc 5249 if (!stacktrace_entries[i])
69a0200c
TZ		 5250 return;
5251
5252 seq_printf(m, "%*c", 1 + spaces, ' ');
5253 sprint_symbol(str, stacktrace_entries[i]);
5254 seq_printf(m, "%s\n", str);
5255 }
5256}
5257
a3785b7e
TZ		 5258static void hist_trigger_print_key(struct seq_file *m,
5259 struct hist_trigger_data *hist_data,
5260 void *key,
5261 struct tracing_map_elt *elt)
7ef224d1
TZ		 5262{
5263 struct hist_field *key_field;
c6afad49 5264 char str[KSYM_SYMBOL_LEN];
69a0200c 5265 bool multiline = false;
85013256 5266 const char *field_name;
7ef224d1
TZ		 5267 unsigned int i;
5268 u64 uval;
5269
5270 seq_puts(m, "{ ");
5271
5272 for_each_hist_key_field(i, hist_data) {
5273 key_field = hist_data->fields[i];
5274
5275 if (i > hist_data->n_vals)
5276 seq_puts(m, ", ");
5277
85013256
TZ		 5278 field_name = hist_field_name(key_field, 0);
5279
0c4a6b46
TZ		 5280 if (key_field->flags & HIST_FIELD_FL_HEX) {
5281 uval = *(u64 *)(key + key_field->offset);
85013256 5282 seq_printf(m, "%s: %llx", field_name, uval);
c6afad49
TZ		 5283 } else if (key_field->flags & HIST_FIELD_FL_SYM) {
5284 uval = *(u64 *)(key + key_field->offset);
5285 sprint_symbol_no_offset(str, uval);
85013256
TZ		 5286 seq_printf(m, "%s: [%llx] %-45s", field_name,
5287 uval, str);
c6afad49
TZ		 5288 } else if (key_field->flags & HIST_FIELD_FL_SYM_OFFSET) {
5289 uval = *(u64 *)(key + key_field->offset);
5290 sprint_symbol(str, uval);
85013256
TZ		 5291 seq_printf(m, "%s: [%llx] %-55s", field_name,
5292 uval, str);
6b4827ad 5293 } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
af6a29bc
TZ		 5294 struct hist_elt_data *elt_data = elt->private_data;
5295 char *comm;
5296
5297 if (WARN_ON_ONCE(!elt_data))
5298 return;
5299
5300 comm = elt_data->comm;
6b4827ad
TZ		 5301
5302 uval = *(u64 *)(key + key_field->offset);
85013256
TZ		 5303 seq_printf(m, "%s: %-16s[%10llu]", field_name,
5304 comm, uval);
31696198
TZ		 5305 } else if (key_field->flags & HIST_FIELD_FL_SYSCALL) {
5306 const char *syscall_name;
5307
5308 uval = *(u64 *)(key + key_field->offset);
5309 syscall_name = get_syscall_name(uval);
5310 if (!syscall_name)
5311 syscall_name = "unknown_syscall";
5312
85013256
TZ		 5313 seq_printf(m, "%s: %-30s[%3llu]", field_name,
5314 syscall_name, uval);
69a0200c
TZ		 5315 } else if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
5316 seq_puts(m, "stacktrace:\n");
5317 hist_trigger_stacktrace_print(m,
5318 key + key_field->offset,
5319 HIST_STACKTRACE_DEPTH);
5320 multiline = true;
4b94f5b7 5321 } else if (key_field->flags & HIST_FIELD_FL_LOG2) {
85013256 5322 seq_printf(m, "%s: ~ 2^%-2llu", field_name,
4b94f5b7 5323 *(u64 *)(key + key_field->offset));
0c4a6b46 5324 } else if (key_field->flags & HIST_FIELD_FL_STRING) {
85013256 5325 seq_printf(m, "%s: %-50s", field_name,
76a3b0c8 5326 (char *)(key + key_field->offset));
7ef224d1 5327 } else {
76a3b0c8 5328 uval = *(u64 *)(key + key_field->offset);
85013256 5329 seq_printf(m, "%s: %10llu", field_name, uval);
7ef224d1
TZ		 5330 }
5331 }
5332
69a0200c
TZ		 5333 if (!multiline)
5334 seq_puts(m, " ");
5335
5336 seq_puts(m, "}");
a3785b7e
TZ		 5337}
5338
5339static void hist_trigger_entry_print(struct seq_file *m,
5340 struct hist_trigger_data *hist_data,
5341 void *key,
5342 struct tracing_map_elt *elt)
5343{
5344 const char *field_name;
5345 unsigned int i;
5346
5347 hist_trigger_print_key(m, hist_data, key, elt);
7ef224d1
TZ		 5348
5349 seq_printf(m, " hitcount: %10llu",
5350 tracing_map_read_sum(elt, HITCOUNT_IDX));
5351
f2606835 5352 for (i = 1; i < hist_data->n_vals; i++) {
85013256
TZ		 5353 field_name = hist_field_name(hist_data->fields[i], 0);
5354
100719dc
TZ		 5355 if (hist_data->fields[i]->flags & HIST_FIELD_FL_VAR ||
5356 hist_data->fields[i]->flags & HIST_FIELD_FL_EXPR)
30350d65
TZ		 5357 continue;
5358
0c4a6b46 5359 if (hist_data->fields[i]->flags & HIST_FIELD_FL_HEX) {
85013256 5360 seq_printf(m, " %s: %10llx", field_name,
0c4a6b46
TZ		 5361 tracing_map_read_sum(elt, i));
5362 } else {
85013256 5363 seq_printf(m, " %s: %10llu", field_name,
0c4a6b46
TZ		 5364 tracing_map_read_sum(elt, i));
5365 }
f2606835
TZ		 5366 }
5367
50450603
TZ		 5368 print_actions(m, hist_data, elt);
5369
7ef224d1
TZ		 5370 seq_puts(m, "\n");
5371}
5372
5373static int print_entries(struct seq_file *m,
5374 struct hist_trigger_data *hist_data)
5375{
5376 struct tracing_map_sort_entry **sort_entries = NULL;
5377 struct tracing_map *map = hist_data->map;
d50c744e 5378 int i, n_entries;
7ef224d1
TZ		 5379
5380 n_entries = tracing_map_sort_entries(map, hist_data->sort_keys,
5381 hist_data->n_sort_keys,
5382 &sort_entries);
5383 if (n_entries < 0)
5384 return n_entries;
5385
5386 for (i = 0; i < n_entries; i++)
5387 hist_trigger_entry_print(m, hist_data,
5388 sort_entries[i]->key,
5389 sort_entries[i]->elt);
5390
5391 tracing_map_destroy_sort_entries(sort_entries, n_entries);
5392
5393 return n_entries;
5394}
5395
52a7f16d
TZ		 5396static void hist_trigger_show(struct seq_file *m,
5397 struct event_trigger_data *data, int n)
7ef224d1 5398{
7ef224d1 5399 struct hist_trigger_data *hist_data;
6e7a2398 5400 int n_entries;
7ef224d1 5401
52a7f16d
TZ		 5402 if (n > 0)
5403 seq_puts(m, "\n\n");
7ef224d1
TZ		 5404
5405 seq_puts(m, "# event histogram\n#\n# trigger info: ");
5406 data->ops->print(m, data->ops, data);
52a7f16d 5407 seq_puts(m, "#\n\n");
7ef224d1
TZ		 5408
5409 hist_data = data->private_data;
5410 n_entries = print_entries(m, hist_data);
6e7a2398 5411 if (n_entries < 0)
7ef224d1 5412 n_entries = 0;
7ef224d1 5413
a3785b7e
TZ		 5414 track_data_snapshot_print(m, hist_data);
5415
7ef224d1
TZ		 5416 seq_printf(m, "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n",
5417 (u64)atomic64_read(&hist_data->map->hits),
5418 n_entries, (u64)atomic64_read(&hist_data->map->drops));
52a7f16d
TZ		 5419}
5420
5421static int hist_show(struct seq_file *m, void *v)
5422{
5423 struct event_trigger_data *data;
5424 struct trace_event_file *event_file;
5425 int n = 0, ret = 0;
5426
5427 mutex_lock(&event_mutex);
5428
5429 event_file = event_file_data(m->private);
5430 if (unlikely(!event_file)) {
5431 ret = -ENODEV;
5432 goto out_unlock;
5433 }
5434
5435 list_for_each_entry_rcu(data, &event_file->triggers, list) {
5436 if (data->cmd_ops->trigger_type == ETT_EVENT_HIST)
5437 hist_trigger_show(m, data, n++);
5438 }
5439
f404da6e
TZ		 5440 if (have_hist_err()) {
5441 seq_printf(m, "\nERROR: %s\n", hist_err_str);
5442 seq_printf(m, " Last command: %s\n", last_hist_cmd);
5443 }
5444
7ef224d1
TZ		 5445 out_unlock:
5446 mutex_unlock(&event_mutex);
5447
5448 return ret;
5449}
5450
5451static int event_hist_open(struct inode *inode, struct file *file)
5452{
5453 return single_open(file, hist_show, file);
5454}
5455
5456const struct file_operations event_hist_fops = {
5457 .open = event_hist_open,
5458 .read = seq_read,
5459 .llseek = seq_lseek,
5460 .release = single_release,
5461};
5462
5463static void hist_field_print(struct seq_file *m, struct hist_field *hist_field)
5464{
85013256
TZ		 5465 const char *field_name = hist_field_name(hist_field, 0);
5466
30350d65
TZ		 5467 if (hist_field->var.name)
5468 seq_printf(m, "%s=", hist_field->var.name);
5469
0ae7961e 5470 if (hist_field->flags & HIST_FIELD_FL_CPU)
8b7622bf 5471 seq_puts(m, "cpu");
067fe038 5472 else if (field_name) {
7e8b88a3
TZ		 5473 if (hist_field->flags & HIST_FIELD_FL_VAR_REF ||
5474 hist_field->flags & HIST_FIELD_FL_ALIAS)
067fe038 5475 seq_putc(m, '$');
ad42febe 5476 seq_printf(m, "%s", field_name);
0ae7961e
TZ		 5477 } else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP)
5478 seq_puts(m, "common_timestamp");
608940da
TZ		 5479
5480 if (hist_field->flags) {
5481 if (!(hist_field->flags & HIST_FIELD_FL_VAR_REF) &&
5482 !(hist_field->flags & HIST_FIELD_FL_EXPR)) {
5483 const char *flags = get_hist_field_flags(hist_field);
5484
5485 if (flags)
5486 seq_printf(m, ".%s", flags);
5487 }
5488 }
7ef224d1
TZ		 5489}
5490
5491static int event_hist_trigger_print(struct seq_file *m,
5492 struct event_trigger_ops *ops,
5493 struct event_trigger_data *data)
5494{
5495 struct hist_trigger_data *hist_data = data->private_data;
30350d65
TZ		 5496 struct hist_field *field;
5497 bool have_var = false;
7ef224d1
TZ		 5498 unsigned int i;
5499
5463bfda
TZ		 5500 seq_puts(m, "hist:");
5501
5502 if (data->name)
5503 seq_printf(m, "%s:", data->name);
5504
5505 seq_puts(m, "keys=");
7ef224d1
TZ		 5506
5507 for_each_hist_key_field(i, hist_data) {
30350d65 5508 field = hist_data->fields[i];
7ef224d1
TZ		 5509
5510 if (i > hist_data->n_vals)
5511 seq_puts(m, ",");
5512
30350d65 5513 if (field->flags & HIST_FIELD_FL_STACKTRACE)
69a0200c
TZ		 5514 seq_puts(m, "stacktrace");
5515 else
30350d65 5516 hist_field_print(m, field);
7ef224d1
TZ		 5517 }
5518
5519 seq_puts(m, ":vals=");
f2606835
TZ		 5520
5521 for_each_hist_val_field(i, hist_data) {
30350d65
TZ		 5522 field = hist_data->fields[i];
5523 if (field->flags & HIST_FIELD_FL_VAR) {
5524 have_var = true;
5525 continue;
5526 }
5527
f2606835
TZ		 5528 if (i == HITCOUNT_IDX)
5529 seq_puts(m, "hitcount");
5530 else {
5531 seq_puts(m, ",");
30350d65
TZ		 5532 hist_field_print(m, field);
5533 }
5534 }
5535
5536 if (have_var) {
5537 unsigned int n = 0;
5538
5539 seq_puts(m, ":");
5540
5541 for_each_hist_val_field(i, hist_data) {
5542 field = hist_data->fields[i];
5543
5544 if (field->flags & HIST_FIELD_FL_VAR) {
5545 if (n++)
5546 seq_puts(m, ",");
5547 hist_field_print(m, field);
5548 }
f2606835
TZ		 5549 }
5550 }
7ef224d1
TZ		 5551
5552 seq_puts(m, ":sort=");
e62347d2
TZ		 5553
5554 for (i = 0; i < hist_data->n_sort_keys; i++) {
5555 struct tracing_map_sort_key *sort_key;
30350d65
TZ		 5556 unsigned int idx, first_key_idx;
5557
5558 /* skip VAR vals */
5559 first_key_idx = hist_data->n_vals - hist_data->n_vars;
e62347d2
TZ		 5560
5561 sort_key = &hist_data->sort_keys[i];
ad42febe
TZ		 5562 idx = sort_key->field_idx;
5563
1a361dfc 5564 if (WARN_ON(idx >= HIST_FIELDS_MAX))
ad42febe 5565 return -EINVAL;
e62347d2
TZ		 5566
5567 if (i > 0)
5568 seq_puts(m, ",");
5569
ad42febe 5570 if (idx == HITCOUNT_IDX)
e62347d2 5571 seq_puts(m, "hitcount");
30350d65
TZ		 5572 else {
5573 if (idx >= first_key_idx)
5574 idx += hist_data->n_vars;
e62347d2 5575 hist_field_print(m, hist_data->fields[idx]);
30350d65 5576 }
e62347d2
TZ		 5577
5578 if (sort_key->descending)
5579 seq_puts(m, ".descending");
5580 }
7ef224d1 5581 seq_printf(m, ":size=%u", (1 << hist_data->map->map_bits));
a4072fe8
TZ		 5582 if (hist_data->enable_timestamps)
5583 seq_printf(m, ":clock=%s", hist_data->attrs->clock);
7ef224d1 5584
c282a386
TZ		 5585 print_actions_spec(m, hist_data);
5586
7ef224d1
TZ		 5587 if (data->filter_str)
5588 seq_printf(m, " if %s", data->filter_str);
5589
83e99914
TZ		 5590 if (data->paused)
5591 seq_puts(m, " [paused]");
5592 else
5593 seq_puts(m, " [active]");
7ef224d1
TZ		 5594
5595 seq_putc(m, '\n');
5596
5597 return 0;
5598}
5599
5463bfda
TZ		 5600static int event_hist_trigger_init(struct event_trigger_ops *ops,
5601 struct event_trigger_data *data)
5602{
5603 struct hist_trigger_data *hist_data = data->private_data;
5604
5605 if (!data->ref && hist_data->attrs->name)
5606 save_named_trigger(hist_data->attrs->name, data);
5607
5608 data->ref++;
5609
5610 return 0;
5611}
5612
02205a67
TZ		 5613static void unregister_field_var_hists(struct hist_trigger_data *hist_data)
5614{
5615 struct trace_event_file *file;
5616 unsigned int i;
5617 char *cmd;
5618 int ret;
5619
5620 for (i = 0; i < hist_data->n_field_var_hists; i++) {
5621 file = hist_data->field_var_hists[i]->hist_data->event_file;
5622 cmd = hist_data->field_var_hists[i]->cmd;
5623 ret = event_hist_trigger_func(&trigger_hist_cmd, file,
5624 "!hist", "hist", cmd);
5625 }
5626}
5627
7ef224d1
TZ		 5628static void event_hist_trigger_free(struct event_trigger_ops *ops,
5629 struct event_trigger_data *data)
5630{
5631 struct hist_trigger_data *hist_data = data->private_data;
5632
5633 if (WARN_ON_ONCE(data->ref <= 0))
5634 return;
5635
5636 data->ref--;
5637 if (!data->ref) {
5463bfda
TZ		 5638 if (data->name)
5639 del_named_trigger(data);
067fe038 5640
7ef224d1 5641 trigger_data_free(data);
067fe038
TZ		 5642
5643 remove_hist_vars(hist_data);
5644
02205a67
TZ		 5645 unregister_field_var_hists(hist_data);
5646
7ef224d1
TZ		 5647 destroy_hist_data(hist_data);
5648 }
5649}
5650
5651static struct event_trigger_ops event_hist_trigger_ops = {
5652 .func = event_hist_trigger,
5653 .print = event_hist_trigger_print,
5463bfda 5654 .init = event_hist_trigger_init,
7ef224d1
TZ		 5655 .free = event_hist_trigger_free,
5656};
5657
5463bfda
TZ		 5658static int event_hist_trigger_named_init(struct event_trigger_ops *ops,
5659 struct event_trigger_data *data)
5660{
5661 data->ref++;
5662
5663 save_named_trigger(data->named_data->name, data);
5664
5665 event_hist_trigger_init(ops, data->named_data);
5666
5667 return 0;
5668}
5669
5670static void event_hist_trigger_named_free(struct event_trigger_ops *ops,
5671 struct event_trigger_data *data)
5672{
5673 if (WARN_ON_ONCE(data->ref <= 0))
5674 return;
5675
5676 event_hist_trigger_free(ops, data->named_data);
5677
5678 data->ref--;
5679 if (!data->ref) {
5680 del_named_trigger(data);
5681 trigger_data_free(data);
5682 }
5683}
5684
5685static struct event_trigger_ops event_hist_trigger_named_ops = {
5686 .func = event_hist_trigger,
5687 .print = event_hist_trigger_print,
5688 .init = event_hist_trigger_named_init,
5689 .free = event_hist_trigger_named_free,
5690};
5691
7ef224d1
TZ		 5692static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd,
5693 char *param)
5694{
5695 return &event_hist_trigger_ops;
5696}
5697
e86ae9ba
TZ		 5698static void hist_clear(struct event_trigger_data *data)
5699{
5700 struct hist_trigger_data *hist_data = data->private_data;
e86ae9ba 5701
5463bfda
TZ		 5702 if (data->name)
5703 pause_named_trigger(data);
e86ae9ba 5704
e0a568dc 5705 tracepoint_synchronize_unregister();
e86ae9ba
TZ		 5706
5707 tracing_map_clear(hist_data->map);
5708
5463bfda
TZ		 5709 if (data->name)
5710 unpause_named_trigger(data);
5711}
5712
5713static bool compatible_field(struct ftrace_event_field *field,
5714 struct ftrace_event_field *test_field)
5715{
5716 if (field == test_field)
5717 return true;
5718 if (field == NULL || test_field == NULL)
5719 return false;
5720 if (strcmp(field->name, test_field->name) != 0)
5721 return false;
5722 if (strcmp(field->type, test_field->type) != 0)
5723 return false;
5724 if (field->size != test_field->size)
5725 return false;
5726 if (field->is_signed != test_field->is_signed)
5727 return false;
5728
5729 return true;
e86ae9ba
TZ		 5730}
5731
52a7f16d 5732static bool hist_trigger_match(struct event_trigger_data *data,
5463bfda
TZ		 5733 struct event_trigger_data *data_test,
5734 struct event_trigger_data *named_data,
5735 bool ignore_filter)
52a7f16d
TZ		 5736{
5737 struct tracing_map_sort_key *sort_key, *sort_key_test;
5738 struct hist_trigger_data *hist_data, *hist_data_test;
5739 struct hist_field *key_field, *key_field_test;
5740 unsigned int i;
5741
5463bfda
TZ		 5742 if (named_data && (named_data != data_test) &&
5743 (named_data != data_test->named_data))
5744 return false;
5745
5746 if (!named_data && is_named_trigger(data_test))
5747 return false;
5748
52a7f16d
TZ		 5749 hist_data = data->private_data;
5750 hist_data_test = data_test->private_data;
5751
5752 if (hist_data->n_vals != hist_data_test->n_vals ||
5753 hist_data->n_fields != hist_data_test->n_fields ||
5754 hist_data->n_sort_keys != hist_data_test->n_sort_keys)
5755 return false;
5756
5463bfda
TZ		 5757 if (!ignore_filter) {
5758 if ((data->filter_str && !data_test->filter_str) ||
5759 (!data->filter_str && data_test->filter_str))
5760 return false;
5761 }
52a7f16d
TZ		 5762
5763 for_each_hist_field(i, hist_data) {
5764 key_field = hist_data->fields[i];
5765 key_field_test = hist_data_test->fields[i];
5766
5767 if (key_field->flags != key_field_test->flags)
5768 return false;
5463bfda 5769 if (!compatible_field(key_field->field, key_field_test->field))
52a7f16d
TZ		 5770 return false;
5771 if (key_field->offset != key_field_test->offset)
5772 return false;
ad42febe
TZ		 5773 if (key_field->size != key_field_test->size)
5774 return false;
5775 if (key_field->is_signed != key_field_test->is_signed)
5776 return false;
1a361dfc
TZ		 5777 if (!!key_field->var.name != !!key_field_test->var.name)
5778 return false;
5779 if (key_field->var.name &&
5780 strcmp(key_field->var.name, key_field_test->var.name) != 0)
5781 return false;
52a7f16d
TZ		 5782 }
5783
5784 for (i = 0; i < hist_data->n_sort_keys; i++) {
5785 sort_key = &hist_data->sort_keys[i];
5786 sort_key_test = &hist_data_test->sort_keys[i];
5787
5788 if (sort_key->field_idx != sort_key_test->field_idx ||
5789 sort_key->descending != sort_key_test->descending)
5790 return false;
5791 }
5792
5463bfda 5793 if (!ignore_filter && data->filter_str &&
52a7f16d
TZ		 5794 (strcmp(data->filter_str, data_test->filter_str) != 0))
5795 return false;
5796
48f79473
TZ		 5797 if (!actions_match(hist_data, hist_data_test))
5798 return false;
5799
52a7f16d
TZ		 5800 return true;
5801}
5802
7ef224d1
TZ		 5803static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
5804 struct event_trigger_data *data,
5805 struct trace_event_file *file)
5806{
83e99914 5807 struct hist_trigger_data *hist_data = data->private_data;
5463bfda 5808 struct event_trigger_data *test, *named_data = NULL;
7ef224d1
TZ		 5809 int ret = 0;
5810
5463bfda
TZ		 5811 if (hist_data->attrs->name) {
5812 named_data = find_named_trigger(hist_data->attrs->name);
5813 if (named_data) {
5814 if (!hist_trigger_match(data, named_data, named_data,
5815 true)) {
f404da6e 5816 hist_err("Named hist trigger doesn't match existing named trigger (includes variables): ", hist_data->attrs->name);
5463bfda
TZ		 5817 ret = -EINVAL;
5818 goto out;
5819 }
5820 }
5821 }
5822
5823 if (hist_data->attrs->name && !named_data)
5824 goto new;
5825
7ef224d1
TZ		 5826 list_for_each_entry_rcu(test, &file->triggers, list) {
5827 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5463bfda 5828 if (!hist_trigger_match(data, test, named_data, false))
52a7f16d 5829 continue;
83e99914
TZ		 5830 if (hist_data->attrs->pause)
5831 test->paused = true;
5832 else if (hist_data->attrs->cont)
5833 test->paused = false;
e86ae9ba
TZ		 5834 else if (hist_data->attrs->clear)
5835 hist_clear(test);
f404da6e
TZ		 5836 else {
5837 hist_err("Hist trigger already exists", NULL);
83e99914 5838 ret = -EEXIST;
f404da6e 5839 }
7ef224d1
TZ		 5840 goto out;
5841 }
5842 }
5463bfda 5843 new:
e86ae9ba 5844 if (hist_data->attrs->cont || hist_data->attrs->clear) {
f404da6e 5845 hist_err("Can't clear or continue a nonexistent hist trigger", NULL);
83e99914
TZ		 5846 ret = -ENOENT;
5847 goto out;
5848 }
5849
7522c03a
TZ		 5850 if (hist_data->attrs->pause)
5851 data->paused = true;
5852
5463bfda 5853 if (named_data) {
5463bfda
TZ		 5854 data->private_data = named_data->private_data;
5855 set_named_trigger_data(data, named_data);
5856 data->ops = &event_hist_trigger_named_ops;
5857 }
5858
7ef224d1
TZ		 5859 if (data->ops->init) {
5860 ret = data->ops->init(data->ops, data);
5861 if (ret < 0)
5862 goto out;
5863 }
5864
a4072fe8
TZ		 5865 if (hist_data->enable_timestamps) {
5866 char *clock = hist_data->attrs->clock;
5867
5868 ret = tracing_set_clock(file->tr, hist_data->attrs->clock);
5869 if (ret) {
5870 hist_err("Couldn't set trace_clock: ", clock);
5871 goto out;
5872 }
7ef224d1 5873
ad42febe 5874 tracing_set_time_stamp_abs(file->tr, true);
a4072fe8
TZ		 5875 }
5876
5877 if (named_data)
5878 destroy_hist_data(hist_data);
5879
5880 ret++;
067fe038
TZ		 5881 out:
5882 return ret;
5883}
5884
5885static int hist_trigger_enable(struct event_trigger_data *data,
5886 struct trace_event_file *file)
5887{
5888 int ret = 0;
5889
5890 list_add_tail_rcu(&data->list, &file->triggers);
5891
5892 update_cond_flag(file);
ad42febe 5893
7ef224d1
TZ		 5894 if (trace_event_trigger_enable_disable(file, 1) < 0) {
5895 list_del_rcu(&data->list);
5896 update_cond_flag(file);
5897 ret--;
5898 }
067fe038 5899
7ef224d1
TZ		 5900 return ret;
5901}
5902
4b147936
TZ		 5903static bool have_hist_trigger_match(struct event_trigger_data *data,
5904 struct trace_event_file *file)
5905{
5906 struct hist_trigger_data *hist_data = data->private_data;
5907 struct event_trigger_data *test, *named_data = NULL;
5908 bool match = false;
5909
5910 if (hist_data->attrs->name)
5911 named_data = find_named_trigger(hist_data->attrs->name);
5912
5913 list_for_each_entry_rcu(test, &file->triggers, list) {
5914 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5915 if (hist_trigger_match(data, test, named_data, false)) {
5916 match = true;
5917 break;
5918 }
5919 }
5920 }
5921
5922 return match;
5923}
5924
067fe038
TZ		 5925static bool hist_trigger_check_refs(struct event_trigger_data *data,
5926 struct trace_event_file *file)
5927{
5928 struct hist_trigger_data *hist_data = data->private_data;
5929 struct event_trigger_data *test, *named_data = NULL;
5930
5931 if (hist_data->attrs->name)
5932 named_data = find_named_trigger(hist_data->attrs->name);
5933
5934 list_for_each_entry_rcu(test, &file->triggers, list) {
5935 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5936 if (!hist_trigger_match(data, test, named_data, false))
5937 continue;
5938 hist_data = test->private_data;
5939 if (check_var_refs(hist_data))
5940 return true;
5941 break;
5942 }
5943 }
5944
5945 return false;
5946}
5947
52a7f16d
TZ		 5948static void hist_unregister_trigger(char *glob, struct event_trigger_ops *ops,
5949 struct event_trigger_data *data,
5950 struct trace_event_file *file)
5951{
5463bfda
TZ		 5952 struct hist_trigger_data *hist_data = data->private_data;
5953 struct event_trigger_data *test, *named_data = NULL;
52a7f16d
TZ		 5954 bool unregistered = false;
5955
5463bfda
TZ		 5956 if (hist_data->attrs->name)
5957 named_data = find_named_trigger(hist_data->attrs->name);
5958
52a7f16d
TZ		 5959 list_for_each_entry_rcu(test, &file->triggers, list) {
5960 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5463bfda 5961 if (!hist_trigger_match(data, test, named_data, false))
52a7f16d
TZ		 5962 continue;
5963 unregistered = true;
5964 list_del_rcu(&test->list);
5965 trace_event_trigger_enable_disable(file, 0);
5966 update_cond_flag(file);
5967 break;
5968 }
5969 }
5970
5971 if (unregistered && test->ops->free)
5972 test->ops->free(test->ops, test);
ad42febe
TZ		 5973
5974 if (hist_data->enable_timestamps) {
30350d65 5975 if (!hist_data->remove || unregistered)
ad42febe
TZ		 5976 tracing_set_time_stamp_abs(file->tr, false);
5977 }
52a7f16d
TZ		 5978}
5979
067fe038
TZ		 5980static bool hist_file_check_refs(struct trace_event_file *file)
5981{
5982 struct hist_trigger_data *hist_data;
5983 struct event_trigger_data *test;
5984
5985 list_for_each_entry_rcu(test, &file->triggers, list) {
5986 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5987 hist_data = test->private_data;
5988 if (check_var_refs(hist_data))
5989 return true;
5990 }
5991 }
5992
5993 return false;
5994}
5995
52a7f16d
TZ		 5996static void hist_unreg_all(struct trace_event_file *file)
5997{
47c18569 5998 struct event_trigger_data *test, *n;
ad42febe 5999 struct hist_trigger_data *hist_data;
4b147936
TZ		 6000 struct synth_event *se;
6001 const char *se_name;
52a7f16d 6002
0e2b81f7
MH		 6003 lockdep_assert_held(&event_mutex);
6004
067fe038
TZ		 6005 if (hist_file_check_refs(file))
6006 return;
6007
47c18569 6008 list_for_each_entry_safe(test, n, &file->triggers, list) {
52a7f16d 6009 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
ad42febe 6010 hist_data = test->private_data;
52a7f16d
TZ		 6011 list_del_rcu(&test->list);
6012 trace_event_trigger_enable_disable(file, 0);
4b147936 6013
4b147936
TZ		 6014 se_name = trace_event_name(file->event_call);
6015 se = find_synth_event(se_name);
6016 if (se)
6017 se->ref--;
4b147936 6018
52a7f16d 6019 update_cond_flag(file);
ad42febe
TZ		 6020 if (hist_data->enable_timestamps)
6021 tracing_set_time_stamp_abs(file->tr, false);
52a7f16d
TZ		 6022 if (test->ops->free)
6023 test->ops->free(test->ops, test);
6024 }
6025 }
6026}
6027
7ef224d1
TZ		 6028static int event_hist_trigger_func(struct event_command *cmd_ops,
6029 struct trace_event_file *file,
6030 char *glob, char *cmd, char *param)
6031{
6032 unsigned int hist_trigger_bits = TRACING_MAP_BITS_DEFAULT;
6033 struct event_trigger_data *trigger_data;
6034 struct hist_trigger_attrs *attrs;
6035 struct event_trigger_ops *trigger_ops;
6036 struct hist_trigger_data *hist_data;
4b147936
TZ		 6037 struct synth_event *se;
6038 const char *se_name;
30350d65 6039 bool remove = false;
ec5ce098 6040 char *trigger, *p;
7ef224d1
TZ		 6041 int ret = 0;
6042
0e2b81f7
MH		 6043 lockdep_assert_held(&event_mutex);
6044
f404da6e
TZ		 6045 if (glob && strlen(glob)) {
6046 last_cmd_set(param);
6047 hist_err_clear();
6048 }
6049
7ef224d1
TZ		 6050 if (!param)
6051 return -EINVAL;
6052
30350d65
TZ		 6053 if (glob[0] == '!')
6054 remove = true;
6055
ec5ce098
TZ		 6056 /*
6057 * separate the trigger from the filter (k:v [if filter])
6058 * allowing for whitespace in the trigger
6059 */
6060 p = trigger = param;
6061 do {
6062 p = strstr(p, "if");
6063 if (!p)
6064 break;
6065 if (p == param)
6066 return -EINVAL;
6067 if (*(p - 1) != ' ' && *(p - 1) != '\t') {
6068 p++;
6069 continue;
6070 }
2f31ed93 6071 if (p >= param + strlen(param) - (sizeof("if") - 1) - 1)
ec5ce098 6072 return -EINVAL;
2f31ed93 6073 if (*(p + sizeof("if") - 1) != ' ' && *(p + sizeof("if") - 1) != '\t') {
ec5ce098
TZ		 6074 p++;
6075 continue;
6076 }
6077 break;
6078 } while (p);
6079
6080 if (!p)
6081 param = NULL;
6082 else {
6083 *(p - 1) = '\0';
6084 param = strstrip(p);
6085 trigger = strstrip(trigger);
6086 }
7ef224d1
TZ		 6087
6088 attrs = parse_hist_trigger_attrs(trigger);
6089 if (IS_ERR(attrs))
6090 return PTR_ERR(attrs);
6091
6092 if (attrs->map_bits)
6093 hist_trigger_bits = attrs->map_bits;
6094
30350d65 6095 hist_data = create_hist_data(hist_trigger_bits, attrs, file, remove);
7ef224d1
TZ		 6096 if (IS_ERR(hist_data)) {
6097 destroy_hist_trigger_attrs(attrs);
6098 return PTR_ERR(hist_data);
6099 }
6100
6101 trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger);
6102
7ef224d1 6103 trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL);
4b147936
TZ		 6104 if (!trigger_data) {
6105 ret = -ENOMEM;
7ef224d1 6106 goto out_free;
4b147936 6107 }
7ef224d1
TZ		 6108
6109 trigger_data->count = -1;
6110 trigger_data->ops = trigger_ops;
6111 trigger_data->cmd_ops = cmd_ops;
6112
6113 INIT_LIST_HEAD(&trigger_data->list);
6114 RCU_INIT_POINTER(trigger_data->filter, NULL);
6115
6116 trigger_data->private_data = hist_data;
6117
52a7f16d
TZ		 6118 /* if param is non-empty, it's supposed to be a filter */
6119 if (param && cmd_ops->set_filter) {
6120 ret = cmd_ops->set_filter(param, trigger_data, file);
6121 if (ret < 0)
6122 goto out_free;
6123 }
6124
30350d65 6125 if (remove) {
4b147936
TZ		 6126 if (!have_hist_trigger_match(trigger_data, file))
6127 goto out_free;
6128
067fe038
TZ		 6129 if (hist_trigger_check_refs(trigger_data, file)) {
6130 ret = -EBUSY;
6131 goto out_free;
6132 }
6133
7ef224d1 6134 cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
4b147936
TZ		 6135 se_name = trace_event_name(file->event_call);
6136 se = find_synth_event(se_name);
6137 if (se)
6138 se->ref--;
7ef224d1
TZ		 6139 ret = 0;
6140 goto out_free;
6141 }
6142
7ef224d1
TZ		 6143 ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file);
6144 /*
6145 * The above returns on success the # of triggers registered,
6146 * but if it didn't register any it returns zero. Consider no
6147 * triggers registered a failure too.
6148 */
6149 if (!ret) {
e86ae9ba 6150 if (!(attrs->pause || attrs->cont || attrs->clear))
83e99914 6151 ret = -ENOENT;
7ef224d1
TZ		 6152 goto out_free;
6153 } else if (ret < 0)
6154 goto out_free;
067fe038
TZ		 6155
6156 if (get_named_trigger_data(trigger_data))
6157 goto enable;
6158
6159 if (has_hist_vars(hist_data))
6160 save_hist_vars(hist_data);
6161
7d18a10c 6162 ret = create_actions(hist_data);
0212e2aa
TZ		 6163 if (ret)
6164 goto out_unreg;
6165
067fe038
TZ		 6166 ret = tracing_map_init(hist_data->map);
6167 if (ret)
6168 goto out_unreg;
6169enable:
6170 ret = hist_trigger_enable(trigger_data, file);
6171 if (ret)
6172 goto out_unreg;
6173
4b147936
TZ		 6174 se_name = trace_event_name(file->event_call);
6175 se = find_synth_event(se_name);
6176 if (se)
6177 se->ref++;
7ef224d1
TZ		 6178 /* Just return zero, not the number of registered triggers */
6179 ret = 0;
6180 out:
f404da6e
TZ		 6181 if (ret == 0)
6182 hist_err_clear();
6183
7ef224d1 6184 return ret;
067fe038
TZ		 6185 out_unreg:
6186 cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
7ef224d1
TZ		 6187 out_free:
6188 if (cmd_ops->set_filter)
6189 cmd_ops->set_filter(NULL, trigger_data, NULL);
6190
067fe038
TZ		 6191 remove_hist_vars(hist_data);
6192
7ef224d1
TZ		 6193 kfree(trigger_data);
6194
6195 destroy_hist_data(hist_data);
6196 goto out;
6197}
6198
6199static struct event_command trigger_hist_cmd = {
6200 .name = "hist",
6201 .trigger_type = ETT_EVENT_HIST,
6202 .flags = EVENT_CMD_FL_NEEDS_REC,
6203 .func = event_hist_trigger_func,
6204 .reg = hist_register_trigger,
52a7f16d
TZ		 6205 .unreg = hist_unregister_trigger,
6206 .unreg_all = hist_unreg_all,
7ef224d1
TZ		 6207 .get_trigger_ops = event_hist_get_trigger_ops,
6208 .set_filter = set_trigger_filter,
6209};
6210
6211__init int register_trigger_hist_cmd(void)
6212{
6213 int ret;
6214
6215 ret = register_event_command(&trigger_hist_cmd);
6216 WARN_ON(ret < 0);
6217
6218 return ret;
6219}
d0bad49b
TZ		 6220
6221static void
1ac4f51c
TZ		 6222hist_enable_trigger(struct event_trigger_data *data, void *rec,
6223 struct ring_buffer_event *event)
d0bad49b
TZ		 6224{
6225 struct enable_trigger_data *enable_data = data->private_data;
6226 struct event_trigger_data *test;
6227
6228 list_for_each_entry_rcu(test, &enable_data->file->triggers, list) {
6229 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6230 if (enable_data->enable)
6231 test->paused = false;
6232 else
6233 test->paused = true;
d0bad49b
TZ		 6234 }
6235 }
6236}
6237
6238static void
1ac4f51c
TZ		 6239hist_enable_count_trigger(struct event_trigger_data *data, void *rec,
6240 struct ring_buffer_event *event)
d0bad49b
TZ		 6241{
6242 if (!data->count)
6243 return;
6244
6245 if (data->count != -1)
6246 (data->count)--;
6247
1ac4f51c 6248 hist_enable_trigger(data, rec, event);
d0bad49b
TZ		 6249}
6250
6251static struct event_trigger_ops hist_enable_trigger_ops = {
6252 .func = hist_enable_trigger,
6253 .print = event_enable_trigger_print,
6254 .init = event_trigger_init,
6255 .free = event_enable_trigger_free,
6256};
6257
6258static struct event_trigger_ops hist_enable_count_trigger_ops = {
6259 .func = hist_enable_count_trigger,
6260 .print = event_enable_trigger_print,
6261 .init = event_trigger_init,
6262 .free = event_enable_trigger_free,
6263};
6264
6265static struct event_trigger_ops hist_disable_trigger_ops = {
6266 .func = hist_enable_trigger,
6267 .print = event_enable_trigger_print,
6268 .init = event_trigger_init,
6269 .free = event_enable_trigger_free,
6270};
6271
6272static struct event_trigger_ops hist_disable_count_trigger_ops = {
6273 .func = hist_enable_count_trigger,
6274 .print = event_enable_trigger_print,
6275 .init = event_trigger_init,
6276 .free = event_enable_trigger_free,
6277};
6278
6279static struct event_trigger_ops *
6280hist_enable_get_trigger_ops(char *cmd, char *param)
6281{
6282 struct event_trigger_ops *ops;
6283 bool enable;
6284
6285 enable = (strcmp(cmd, ENABLE_HIST_STR) == 0);
6286
6287 if (enable)
6288 ops = param ? &hist_enable_count_trigger_ops :
6289 &hist_enable_trigger_ops;
6290 else
6291 ops = param ? &hist_disable_count_trigger_ops :
6292 &hist_disable_trigger_ops;
6293
6294 return ops;
6295}
6296
52a7f16d
TZ		 6297static void hist_enable_unreg_all(struct trace_event_file *file)
6298{
47c18569 6299 struct event_trigger_data *test, *n;
52a7f16d 6300
47c18569 6301 list_for_each_entry_safe(test, n, &file->triggers, list) {
52a7f16d
TZ		 6302 if (test->cmd_ops->trigger_type == ETT_HIST_ENABLE) {
6303 list_del_rcu(&test->list);
6304 update_cond_flag(file);
6305 trace_event_trigger_enable_disable(file, 0);
6306 if (test->ops->free)
6307 test->ops->free(test->ops, test);
6308 }
6309 }
6310}
6311
d0bad49b
TZ		 6312static struct event_command trigger_hist_enable_cmd = {
6313 .name = ENABLE_HIST_STR,
6314 .trigger_type = ETT_HIST_ENABLE,
6315 .func = event_enable_trigger_func,
6316 .reg = event_enable_register_trigger,
6317 .unreg = event_enable_unregister_trigger,
52a7f16d 6318 .unreg_all = hist_enable_unreg_all,
d0bad49b
TZ		 6319 .get_trigger_ops = hist_enable_get_trigger_ops,
6320 .set_filter = set_trigger_filter,
6321};
6322
6323static struct event_command trigger_hist_disable_cmd = {
6324 .name = DISABLE_HIST_STR,
6325 .trigger_type = ETT_HIST_ENABLE,
6326 .func = event_enable_trigger_func,
6327 .reg = event_enable_register_trigger,
6328 .unreg = event_enable_unregister_trigger,
52a7f16d 6329 .unreg_all = hist_enable_unreg_all,
d0bad49b
TZ		 6330 .get_trigger_ops = hist_enable_get_trigger_ops,
6331 .set_filter = set_trigger_filter,
6332};
6333
6334static __init void unregister_trigger_hist_enable_disable_cmds(void)
6335{
6336 unregister_event_command(&trigger_hist_enable_cmd);
6337 unregister_event_command(&trigger_hist_disable_cmd);
6338}
6339
6340__init int register_trigger_hist_enable_disable_cmds(void)
6341{
6342 int ret;
6343
6344 ret = register_event_command(&trigger_hist_enable_cmd);
6345 if (WARN_ON(ret < 0))
6346 return ret;
6347 ret = register_event_command(&trigger_hist_disable_cmd);
6348 if (WARN_ON(ret < 0))
6349 unregister_trigger_hist_enable_disable_cmds();
6350
6351 return ret;
6352}
4b147936
TZ		 6353
6354static __init int trace_events_hist_init(void)
6355{
6356 struct dentry *entry = NULL;
6357 struct dentry *d_tracer;
6358 int err = 0;
6359
7bbab38d
MH		 6360 err = dyn_event_register(&synth_event_ops);
6361 if (err) {
6362 pr_warn("Could not register synth_event_ops\n");
6363 return err;
6364 }
6365
4b147936
TZ		 6366 d_tracer = tracing_init_dentry();
6367 if (IS_ERR(d_tracer)) {
6368 err = PTR_ERR(d_tracer);
6369 goto err;
6370 }
6371
6372 entry = tracefs_create_file("synthetic_events", 0644, d_tracer,
6373 NULL, &synth_events_fops);
6374 if (!entry) {
6375 err = -ENODEV;
6376 goto err;
6377 }
6378
6379 return err;
6380 err:
6381 pr_warn("Could not create tracefs 'synthetic_events' entry\n");
6382
6383 return err;
6384}
6385
6386fs_initcall(trace_events_hist_init);
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